Yaml order incorrect when creating the config

Hello,

I have the following configuration:

```yaml
inputs:
- mqtt_consumer:
servers: ["tcp://192.168.1.3:1883"]
username: consumer
password: something
topics:
- solar/+/0/power
data_format: value
data_type: float
topic_parsing:
- topic: solar/116182009632/0/+
measurement: _/_/measurement
tags: inverter/channel/_
```

But when the chart creates toml from it, the result is:

```toml
[[inputs.mqtt_consumer]]
data_format = "value"
data_type = "float"
password = "something"
servers = [
"tcp://192.168.1.3:1883"
]
[[inputs.mqtt_consumer.topic_parsing]]
measurement = "_/_/measurement"
tags = "inverter/channel/_"
topic = "solar/+"
topics = [
"solar/+/0/power"
]
username = "consumer"
```

topics and username come after topic_parsing and cannot be handled correctly.

I get the error "plugin inputs.mqtt_consumer: line 26: configuration specified the fields ["topics" "username"], but they weren't used
"