Add GroupId to PushNotificationReceivedJob

Pending message requests should probably be made sequentially.

// FREEBIE

src/org/thoughtcrime/securesms/jobs/PushNotificationReceiveJob.java

@@ -24,6 +24,7 @@ public class PushNotificationReceiveJob extends PushReceivedJob implements Injec
   public PushNotificationReceiveJob(Context context) {
     super(context, JobParameters.newBuilder()
                                 .withRequirement(new NetworkRequirement(context))
+                                .withGroupId("__notification_received")
                                 .withWakeLock(true, 30, TimeUnit.SECONDS).create());
   }