Fix issue with websocket connection after reregistering.

Big shoutout to @jonahbeckford for the investigation here. Thanks!

Fixes #10939
Fixes #11095

app/src/main/java/org/thoughtcrime/securesms/messages/IncomingMessageObserver.java

@@ -104,6 +104,10 @@ public class IncomingMessageObserver {
     }, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
   }
 
+  public synchronized void notifyRegistrationChanged() {
+    notifyAll();
+  }
+
   public synchronized void addDecryptionDrainedListener(@NonNull Runnable listener) {
     decryptionDrainedListeners.add(listener);
     if (decryptionDrained) {

app/src/main/java/org/thoughtcrime/securesms/util/TextSecurePreferences.java

@@ -17,6 +17,7 @@ import org.greenrobot.eventbus.EventBus;
 import org.signal.core.util.logging.Log;
 import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.backup.BackupProtos;
+import org.thoughtcrime.securesms.dependencies.ApplicationDependencies;
 import org.thoughtcrime.securesms.jobmanager.impl.SqlCipherMigrationConstraintObserver;
 import org.thoughtcrime.securesms.keyvalue.SettingsValues;
 import org.thoughtcrime.securesms.lock.RegistrationLockReminders;
@@ -919,6 +920,7 @@ public class TextSecurePreferences {
   public static void setPushRegistered(Context context, boolean registered) {
     Log.i(TAG, "Setting push registered: " + registered);
     setBooleanPreference(context, REGISTERED_GCM_PREF, registered);
+    ApplicationDependencies.getIncomingMessageObserver().notifyRegistrationChanged();
   }
 
   public static boolean isShowInviteReminders(Context context) {