Port #942 from yuzu: "qt: Minor cleanup-related changes"

src/citra_qt/aboutdialog.cpp

@@ -17,6 +17,4 @@ AboutDialog::AboutDialog(QWidget* parent)
                                        Common::g_scm_desc, QString(Common::g_build_date).left(10)));
 }
 
-AboutDialog::~AboutDialog() {
-    delete ui;
-}
+AboutDialog::~AboutDialog() = default;