Update message sender in SyncNotificationsService

sync/work/src/main/java/com/google/samples/apps/nowinandroid/sync/services/SyncNotificationsService.kt

@@ -19,10 +19,11 @@ package com.google.samples.apps.nowinandroid.sync.services
 import com.google.firebase.messaging.FirebaseMessagingService
 import com.google.firebase.messaging.RemoteMessage
 import com.google.samples.apps.nowinandroid.core.data.util.SyncManager
-import com.google.samples.apps.nowinandroid.sync.initializers.SYNC_TOPIC
 import dagger.hilt.android.AndroidEntryPoint
 import javax.inject.Inject
 
+private const val SYNC_TOPIC_SENDER = "/topics/sync"
+
 @AndroidEntryPoint
 class SyncNotificationsService : FirebaseMessagingService() {
 
@@ -30,7 +31,7 @@ class SyncNotificationsService : FirebaseMessagingService() {
     lateinit var syncManager: SyncManager
 
     override fun onMessageReceived(message: RemoteMessage) {
-        if (SYNC_TOPIC == message.from) {
+        if (SYNC_TOPIC_SENDER == message.from) {
             syncManager.requestSync()
         }
     }