Revert "Move internal modifier to the object to work around build errors"

This reverts commit fd939d5a48.

core/datastore/src/main/kotlin/com/google/samples/apps/nowinandroid/core/datastore/di/DataStoreModule.kt

@@ -41,7 +41,7 @@ object DataStoreModule {
 
     @Provides
     @Singleton
-    fun providesUserPreferencesDataStore(
+    internal fun providesUserPreferencesDataStore(
         @ApplicationContext context: Context,
         @Dispatcher(IO) ioDispatcher: CoroutineDispatcher,
         @ApplicationScope scope: CoroutineScope,

sync/work/src/prod/kotlin/com/google/samples/apps/nowinandroid/sync/di/SyncModule.kt

@@ -43,9 +43,9 @@ abstract class SyncModule {
         syncSubscriber: FirebaseSyncSubscriber,
     ): SyncSubscriber
 
-    internal companion object {
+    companion object {
         @Provides
         @Singleton
-        fun provideFirebaseMessaging(): FirebaseMessaging = Firebase.messaging
+        internal fun provideFirebaseMessaging(): FirebaseMessaging = Firebase.messaging
     }
 }