[Testing]: write tests for logLevel in setDefaults

We're missing coverage for L490-492 where we set logLevel to Error. 

```typescript
    case LogLevel.Error:
      logger.level = Level.Error
      args.verbose = false
      break
```

https://github.com/coder/code-server/blob/main/src/node/cli.ts#L490-L492

write test for `setDefaults` and pass in error for log level. assert level and verbose