make update messages not selectable

app/src/main/java/org/thoughtcrime/securesms/conversation/ConversationFragment.java

@@ -1029,6 +1029,7 @@ public class ConversationFragment extends Fragment
 
     @Override
     public void onItemClick(MessageRecord messageRecord) {
+      if (messageRecord.isUpdate()) return;
       if (actionMode != null) {
         ((ConversationAdapter) list.getAdapter()).toggleSelection(messageRecord);
         list.getAdapter().notifyDataSetChanged();
@@ -1044,6 +1045,7 @@ public class ConversationFragment extends Fragment
 
     @Override
     public void onItemLongClick(MessageRecord messageRecord) {
+      if (messageRecord.isUpdate()) return;
       if (actionMode == null) {
         ((ConversationAdapter) list.getAdapter()).toggleSelection(messageRecord);
         list.getAdapter().notifyDataSetChanged();