Deck shows differences with route that have more than 3 methods defined

It appears that deck (v 1.8.2) does not like having more than 3 methods defined in a route.

The following yaml shows the issue with a route with more than 3 methods, i have used 2 select tags as thats what i am using

```yaml
_format_version: '1.1'
_info:
select_tags:
- test
- route
routes:
- methods:
- GET
- DELETE
- POST
- PUT
- PATCH
name: test_route
https_redirect_status_code: 426
path_handling: v1
```

Running a deck sync creates the route but when you run a diff or a sync again it shows its updating the route but with no change flags (+-) on any line. Looking at the output closely you see its only showing 3 elements in the methods.

```
updating route test_route {
"https_redirect_status_code": 426,
"id": "985c5808-f55f-4766-932d-d091e89abfc2",
"methods": [
"GET",
"PATCH",
"POST",
],
"name": "test_route",
"path_handling": "v1",
"preserve_host": false,
"protocols": [
"http",
"https"
],
"regex_priority": 0,
"strip_path": false,
"tags": [
"test",
]
}

Summary:
Created: 0
Updated: 1
Deleted: 0
```

Looking at the route from the admin api you see all the methods

```json
{
"strip_path": false,
"tags": [
"route",
"test"
],
"paths": null,
"destinations": null,
"headers": null,
"protocols": [
"http",
"https"
],
"created_at": 1633605274,
"snis": null,
"service": null,
"name": "test_route",
"methods": [
"DELETE",
"GET",
"PATCH",
"POST",
"PUT"
],
"preserve_host": false,
"regex_priority": 0,
"updated_at": 1633605274,
"sources": null,
"id": "985c5808-f55f-4766-932d-d091e89abfc2",
"https_redirect_status_code": 426,
"hosts": null,
"path_handling": "v1"
}
```