Qt ui: only stop repeat sounds (#2577)

selfdrive/ui/qt/qt_sound.cc

@@ -18,9 +18,12 @@ bool QtSound::play(AudibleAlert alert) {
 
 void QtSound::stop() {
   for (auto &kv : sounds) {
+    // Only stop repeating sounds
+    if (sound_map[kv.first].second != 0) {
       kv.second.stop();
     }
   }
+}
 
 void QtSound::setVolume(int volume) {
   // TODO: implement this