Improve timer event generation from GV2 sync messages.

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

@@ -2002,10 +2002,17 @@ public final class MessageContentProcessor {
   }
 
   private long handleSynchronizeSentExpirationUpdate(@NonNull SentTranscriptMessage message)
-      throws MmsException, BadGroupIdException
+      throws MmsException
   {
     log(message.getTimestamp(), "Synchronize sent expiration update.");
 
+    Optional<GroupId> groupId = getSyncMessageDestination(message).getGroupId();
+
+    if (groupId.isPresent() && groupId.get().isV2()) {
+      warn(String.valueOf(message.getTimestamp()), "Expiration update received for GV2. Ignoring.");
+      return -1;
+    }
+
     MessageTable database  = SignalDatabase.messages();
     Recipient    recipient = getSyncMessageDestination(message);