citra_qt/configuration: fix language configuration issues

src/citra_qt/configuration/configure_audio.h

@@ -20,12 +20,12 @@ public:
 
     void applyConfiguration();
     void retranslateUi();
+    void setConfiguration();
 
 public slots:
     void updateAudioDevices(int sink_index);
 
 private:
-    void setConfiguration();
     void setOutputSinkFromSinkID();
     void setAudioDeviceFromDeviceID();
     void setVolumeIndicatorText(int percentage);