Platform is always overriden to Node.js

## Expected Behavior
When setting platform it is never received as sent

## Current Behavior
Platform is always overridden to "Node.js"

## Possible Solution

## Steps to Reproduce
1. Send this event to amplitude with the sdk:

```
{
user_id: '60245c08b45ec4007022ec13',
device_id: 'c3dae446-7d15-44fb-9751-16e4b38df58b',
event_type: 'ACTION_INSERT_TOPIC_THREAD_COMMENT',
insert_id: 'bbe59f0d-2bc2-47a7-8543-684072e7785d',
time: 1612996899714,
session_id: '1612996076612',
app_version: '@bubbles/web-ui@2.0.3',
language: 'en-US',
ip: '71.198.20.116',
platform: 'Chrome@88.0.4324.146',
os_name: 'Mac OS',
os_version: '10.15.7',
device_brand: undefined,
device_model: undefined,
event_properties: {
viewId: 'e155c739-3f77-46f7-8123-2dd5dea599fc',
originTopicId: 'e155c739-3f77-46f7-8123-2dd5dea599fc',
originUserEmail: undefined,
originUserName: 'Amplitude2',
isUserAction: false,
actionType: 'INSERT_TOPIC_THREAD_COMMENT',
actionId: 'bbe59f0d-2bc2-47a7-8543-684072e7785d',
isServerGenerated: undefined,
userAgent: {
ua: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.146 Safari/537.36',
browser: { name: 'Chrome', version: '88.0.4324.146', major: '88' },
engine: { name: 'Blink', version: '88.0.4324.146' },
os: { name: 'Mac OS', version: '10.15.7' },
device: { vendor: undefined, model: undefined, type: undefined },
cpu: { architecture: undefined }
},
payload: {
threadId: '01cdebcd-39b5-4714-9321-c5644da49f32',
archived: false,
topicId: 'e155c739-3f77-46f7-8123-2dd5dea599fc',
participantEmails: [ [length]: 0 ],
name: 'Amplitude2',
id: '2c916ba6-ec74-4632-9a54-c5ca652102ec',
body: 'test2',
userId: '60245c08b45ec4007022ec13',
timestamp: 1612996899918
}
},
user_properties: {
originUserEmail: undefined,
originUserName: 'Amplitude2',
userAgent: {
ua: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.146 Safari/537.36',
browser: { name: 'Chrome', version: '88.0.4324.146', major: '88' },
engine: { name: 'Blink', version: '88.0.4324.146' },
os: { name: 'Mac OS', version: '10.15.7' },
device: { vendor: undefined, model: undefined, type: undefined },
cpu: { architecture: undefined }
}
}
}
```

2. Note that the event received from the amplitude event stream "raw" log now has reset platform to `Node.js`:

```
{
"$insert_id": "9eb32219-3af0-47dd-91f6-359438c901dc",
"$row_source": "realtime",
"$schema": 12,
"_time": 1612996625311,
"adid": null,
"amplitude_attribution_ids": null,
"amplitude_event_type": null,
"amplitude_id": 233091255869,
"app": 310020,
"city": "San Francisco",
"client_event_time": "2021-02-10T22:37:05.311",
"client_upload_time": "2021-02-10T22:37:15.619",
"country": "United States",
"data": {
},
"device_brand": null,
"device_carrier": null,
"device_family": null,
"device_id": "c3dae446-7d15-44fb-9751-16e4b38df58b",
"device_manufacturer": null,
"device_model": null,
"device_type": null,
"display_name": "ACTION_INSERT_TOPIC_THREAD_COMMENT",
"dma": "San Francisco-Oakland-San Jose, CA",
"event_id": 854747387,
"event_properties": {
"actionId": "9eb32219-3af0-47dd-91f6-359438c901dc",
"actionType": "INSERT_TOPIC_THREAD_COMMENT",
"isUserAction": false,
"originTopicId": "e155c739-3f77-46f7-8123-2dd5dea599fc",
"originUserName": "Amplitude2",
"payload.archived": false,
"payload.body": "test",
"payload.id": "0743bb3b-cf46-47c3-aaf6-bd2a3f820683",
"payload.name": "Amplitude2",
"payload.participantEmails": [
],
"payload.threadId": "01cdebcd-39b5-4714-9321-c5644da49f32",
"payload.timestamp": 1612996624513,
"payload.topicId": "e155c739-3f77-46f7-8123-2dd5dea599fc",
"payload.userId": "60245c08b45ec4007022ec13",
"userAgent.browser.major": "88",
"userAgent.browser.name": "Chrome",
"userAgent.browser.version": "88.0.4324.146",
"userAgent.engine.name": "Blink",
"userAgent.engine.version": "88.0.4324.146",
"userAgent.os.name": "Mac OS",
"userAgent.os.version": "10.15.7",
"userAgent.ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.146 Safari/537.36",
"viewId": "e155c739-3f77-46f7-8123-2dd5dea599fc"
},
"event_time": "2021-02-10T22:37:05.311",
"event_type": "ACTION_INSERT_TOPIC_THREAD_COMMENT",
"group_properties": {
},
"groups": {
},
"idfa": null,
"ip_address": "71.198.20.116",
"is_attribution_event": false,
"language": "English",
"library": "amplitude-node/1.3.2",
"location_lat": null,
"location_lng": null,
"os": "Mac OS 10.15.7",
"os_name": "Mac OS",
"os_version": "10.15.7",
"paying": null,
"platform": "Node.js",
"region": "California",
"sample_rate": null,
"server_received_time": "2021-02-10 22:37:15.619000",
"server_upload_time": "2021-02-10T22:37:15.641",
"session_id": 1612996076612,
"start_version": "@bubbles/web-ui@2.0.3",
"timeline_hidden": false,
"user_creation_time": "2021-02-10T22:19:55.227",
"user_id": "60245c08b45ec4007022ec13",
"user_properties": {
"originUserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.146 Safari/537.36",
"originUserName": "Amplitude2",
"userAgent.browser.major": "88",
"userAgent.browser.name": "Chrome",
"userAgent.browser.version": "88.0.4324.146",
"userAgent.engine.name": "Blink",
"userAgent.engine.version": "88.0.4324.146",
"userAgent.os.name": "Mac OS",
"userAgent.os.version": "10.15.7",
"userAgent.ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.146 Safari/537.36"
},
"uuid": "8771ca20-6bf0-11eb-9ed4-0231551a9deb",
"version_name": "@bubbles/web-ui@2.0.3"
}
```

## Environment
- SDK Version: 1.3.2
- Node version: 12.14.1