Dont reset settingspage changed status when window is shown

This is done by Init in Load() when the settings is opened.

src/settings/settingspage.h

@@ -65,9 +65,6 @@ class SettingsPage : public QWidget {
 
   void set_changed() { changed_ = true; }
 
- protected:
-  void showEvent(QShowEvent *e) override;
-
  private:
   virtual void Save() = 0;
   virtual void Cancel() {}