refactor: clean up.

- Removed SyncDevice, device name since it's not used anymore by syncyomi server.
- Removed SyncStatus, used internally in the server doesn't need the data to be sent from tachi app.
- This way we just keep the manga data/backup that we can send to many services more generic.

Signed-off-by: KaiserBh <kaiserbh@proton.me>

domain/src/main/java/tachiyomi/domain/sync/SyncPreferences.kt

@@ -12,11 +12,6 @@ class SyncPreferences(
 
     fun syncInterval() = preferenceStore.getInt("sync_interval", 0)
 
-    fun deviceName() = preferenceStore.getString(
-        Preference.appStateKey("device_name"),
-        android.os.Build.MANUFACTURER + android.os.Build.PRODUCT,
-    )
-
     fun syncService() = preferenceStore.getInt("sync_service", 0)
 
     private fun googleDriveAccessToken() = preferenceStore.getString(