[Bug]: UI not working on jeedom homebridge
### What happened?

The UI Wizard is not working on Homebridge plugin for Jeedom. I'm stuck on the wheel.
![image](https://user-images.githubusercontent.com/9718673/170858195-5fc06bbb-b65b-4cc0-bef8-fee864c4c0ff.png)

So I configured the plugin via JSON, but it seems that "enableCamera": true is not taken into account? so i can't use them.
My JSON: 
{
    "platform": "EufySecurity",
    "username": "********@*****.com",
    "password": "**********",
    "enableCamera": true,
    "country": "FR"
}

I also noticed the following error in the log attached.

### Device Type

other (UnSupported)

### Plugin Version

v2.0.x (Supported)

### HomeBridge Version

v1.4.x (Supported)

### NodeJS Version

v14 (Supported)

### Operating System

Debian 10+ (Supported)

### Relevant log output

```shell
[29/05/2022, 09:53:59] [Homebridge UI] [homebridge-eufy-security] /usr/lib/node_modules/homebridge-eufy-security/homebridge-ui/server.js:107
      this.config['country'] = body.country ??= 'US';
                                            ^^^

SyntaxError: Unexpected token '??='
    at wrapSafe (internal/modules/cjs/loader.js:1001:16)
    at Module._compile (internal/modules/cjs/loader.js:1049:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1114:10)
    at Module.load (internal/modules/cjs/loader.js:950:32)
    at Function.Module._load (internal/modules/cjs/loader.js:790:12)
    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:75:12)
    at internal/main/run_main_module.js:17:47
```
