Remove unneeded annotations and some cleanup

app/src/main/java/eu/kanade/tachiyomi/App.kt

@@ -1,8 +1,6 @@
 package eu.kanade.tachiyomi
 
 import android.app.Application
-import android.content.Context
-import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import org.acra.ACRA
 import org.acra.annotation.ReportsCrashes
 import timber.log.Timber
@@ -17,29 +15,16 @@ import uy.kohesive.injekt.Injekt
 )
 open class App : Application() {
 
-    var appTheme = 0
-
     override fun onCreate() {
         super.onCreate()
         Injekt.importModule(AppModule(this))
         if (BuildConfig.DEBUG) Timber.plant(Timber.DebugTree())
 
-        setupTheme()
         setupAcra()
     }
 
-    private fun setupTheme() {
-        appTheme = PreferencesHelper.getTheme(this)
-    }
-
     protected open fun setupAcra() {
         ACRA.init(this)
     }
 
-    companion object {
-        @JvmStatic
-        fun get(context: Context): App {
-            return context.applicationContext as App
-        }
-    }
 }