[Bug] Sonarr not using v3 MediaCover endpoint for covers

[Qstick]

Describe the Bug
6.0 uses v3 endpoints for Sonarr for most things, however mediacovers don't seem to be

https://github.com/CometTools/LunaSea/blob/master/lib/modules/sonarr/core/state.dart#L270

To Reproduce
Run a v4 build with Lunasea 6, see no covers

Expected Behaviour
Use v3 API endpoints for covers

Screenshots

Versions
6.0.0 (60000003)
Sonarr v4 alpha

Additional context
None