Merge pull request #7219 from ligfx/mappingwindow_hotplug

Qt/MappingWindow: update devices combo box when hotplugging devices

Source/Core/DolphinQt/Settings.h

@@ -164,6 +164,7 @@ signals:
   void DebugFontChanged(QFont font);
   void AutoUpdateTrackChanged(const QString& mode);
   void AnalyticsToggled(bool enabled);
+  void DevicesChanged();
 
 private:
   bool m_batch = false;