fix: When already connected and authenticated we do not need to retry.

jicoco-mucclient/src/main/java/org/jitsi/xmpp/mucclient/MucClient.java

@@ -728,7 +728,7 @@ private Callable<Boolean> getConnectAndLoginCallable()
                 return false;
             }
 
-            return true;
+            return false; // we are connected and logged in, so we don't need to retry
         };
     }