Allow one to enable/disable unit tester exit

Memo to self: Hardware renderers often exit in a silent segfault. Look into this at some point.

src/qt/qt_settingsotherperipherals.hpp

@@ -30,6 +30,7 @@ private slots:
     void on_comboBoxCard1_currentIndexChanged(int index);
     void on_pushButtonConfigureRTC_clicked();
     void on_comboBoxRTC_currentIndexChanged(int index);
+    void on_pushButtonConfigureUT_clicked();
 
 private:
     Ui::SettingsOtherPeripherals *ui;