frontend-plugins: Fix auto scene switcher not saving settings on close

The `done` event does not emit a `closeEvent`, but saving is only
implemented in that event handler. Changing this to `close` correctly
triggers the default QWidget event and thus settings are saved.

UI/frontend-plugins/frontend-tools/auto-scene-switcher.cpp

@@ -128,9 +128,10 @@ SceneSwitcher::SceneSwitcher(QWidget *parent)
 		SetStopped();
 
 	loading = false;
+	connect(this, &QDialog::finished, this, &SceneSwitcher::finished);
 }
 
-void SceneSwitcher::closeEvent(QCloseEvent *)
+void SceneSwitcher::finished()
 {
 	obs_frontend_save();
 }

UI/frontend-plugins/frontend-tools/auto-scene-switcher.hpp

@@ -21,8 +21,6 @@ public:
 
 	SceneSwitcher(QWidget *parent);
 
-	void closeEvent(QCloseEvent *event) override;
-
 	void SetStarted();
 	void SetStopped();
 
@@ -41,6 +39,7 @@ public slots:
 	void on_noMatchSwitchScene_currentTextChanged(const QString &text);
 	void on_checkInterval_valueChanged(int value);
 	void on_toggleStartButton_clicked();
+	void finished();
 };
 
 void GetWindowList(std::vector<std::string> &windows);