fix: Only use prefix switching if we have complex bundles

lib/pages/chat.dart

@@ -739,6 +739,7 @@ class ChatController extends State<Chat> {
   }
 
   void onInputBarChanged(String text) {
+    if (text.endsWith(' ') && matrix.hasComplexBundles) {
       final clients = currentRoomBundle;
       for (final client in clients) {
         final prefix = client.sendPrefix;
@@ -752,6 +753,7 @@ class ChatController extends State<Chat> {
           return;
         }
       }
+    }
     typingCoolDown?.cancel();
     typingCoolDown = Timer(Duration(seconds: 2), () {
       typingCoolDown = null;