Resubmit - Prevent settings from being saved when close button is pressed instead of save (#1747)

* Do not save settings when close button pressed instead of save

* Update src/common/config.h

Co-authored-by: TheTurtle <geoster3d@gmail.com>

* Revert "Update src/common/config.h"

This reverts commit 125303ea86.

---------

Co-authored-by: rainmakerv2 <30595646+jpau02@users.noreply.github.com>
Co-authored-by: TheTurtle <geoster3d@gmail.com>

src/qt_gui/settings_dialog.h

@@ -31,6 +31,8 @@ signals:
 
 private:
     void LoadValuesFromConfig();
+    void UpdateSettings();
+    void ResetInstallFolders();
     void InitializeEmulatorLanguages();
     void OnLanguageChanged(int index);
     void OnCursorStateChanged(s16 index);