Use plugin-path didn't work
### Analysis

Hi folks, my idea is to create an instance with their own plugins (not shared with the other ones) then I do the following:

`sudo hb-service install --service-name homebridge-mqtt --port 8583 --user homebridge`

Then inside of the "/var/lib/homebridge-mqtt" folder I do

`sudo -E -n npm install homebridge-mqttthing@latest`

Then

`sudo hb-service uninstall -S homebridge-mqtt`

And finally

`sudo hb-service install --plugin-path /var/lib/homebridge-mqtt/node_modules/ --service-name homebridge-mqtt --port 8583 --user homebridge`

But the instance not load the homebridge-mqttthing plugin stored in the node_modules folder

Thanks in advance

### Expected Behavior

Load the homebridge-mqttthing plugin in this instance only

### Steps To Reproduce

Explained in the Analysis

### Logs

```markdown
[HB Supervisor] Starting Homebridge with extra flags: -I
[30/11/2021, 10:36:08] [HB Supervisor] Started Homebridge v1.3.8 with PID: 16153
[30/11/2021, 10:36:10] Loaded config.json with 0 accessories and 1 platforms.
[30/11/2021, 10:36:10] Loaded 0 cached accessories from cachedAccessories.
[30/11/2021, 10:36:10] ---
[30/11/2021, 10:36:12] Loaded plugin: homebridge-config-ui-x@4.41.3
[30/11/2021, 10:36:12] Registering platform 'homebridge-config-ui-x.config'
[30/11/2021, 10:36:12] ---
[30/11/2021, 10:36:12] Loaded plugin: homebridge-delay-switch@2.2.6
[30/11/2021, 10:36:12] Registering accessory 'homebridge-delay-switch.DelaySwitch'
[30/11/2021, 10:36:12] ---
[30/11/2021, 10:36:12] Loaded plugin: homebridge-mqtt-switch-tasmota@0.9.9
[30/11/2021, 10:36:12] Registering accessory 'homebridge-mqtt-switch-tasmota.mqtt-switch-tasmota'
[30/11/2021, 10:36:12] ---
[30/11/2021, 10:36:12] Loading 1 platforms...
[30/11/2021, 10:36:12] [Config] Initializing config platform...
[30/11/2021, 10:36:12] [Config] Running in Service Mode
```


### Configuration

```json
{
    "bridge": {
        "name": "homebridge-mqtt",
        "username": "0E:92:B3:67:FA:D8",
        "port": 51802,
        "pin": "580-56-621"
    },
    "accessories": [],
    "platforms": [
        {
            "name": "Config",
            "port": 8583,
            "platform": "config"
        }
    ]
}
```


### Environment

- OS: Raspbian
- Software: Latest
- Node: 16.13
- npm: 8.1.4


### Process Supervisor

hb-service

### Additional Context

_No response_