Add websocket condition

src/advanced-scene-switcher.cpp

@@ -227,6 +227,8 @@ void SwitcherData::Thread()
 			}
 		}
 
+		websocketMessages.clear();
+
 		// After this point we will call frontend functions like
 		// obs_frontend_set_current_scene() and
 		// obs_frontend_set_current_transition()