frontend: Update parent logic for systray menu projector items

Adding some more cleanup with Qt Widget/Object parenting and manual
deletes.

Author: RytoEX

frontend/widgets/OBSBasic.cpp

@@ -1407,8 +1407,6 @@ void OBSBasic::applicationShutdown() noexcept
 		patronJsonThread->wait();
 
 	delete screenshotData;
-	delete previewProjector;
-	delete studioProgramProjector;
 	delete previewProjectorSource;
 	delete previewProjectorMain;
 	delete sourceProjector;

frontend/widgets/OBSBasic_SysTray.cpp

@@ -47,8 +47,8 @@ void OBSBasic::SystemTrayInit()
 					trayMenu);
 	exit = new QAction(QTStr("Exit"), trayMenu);
 
-	previewProjector = new QMenu(QTStr("Projector.Open.Preview"));
-	studioProgramProjector = new QMenu(QTStr("Projector.Open.Program"));
+	previewProjector = new QMenu(QTStr("Projector.Open.Preview"), trayMenu);
+	studioProgramProjector = new QMenu(QTStr("Projector.Open.Program"), trayMenu);
 	OBSBasic::updateSysTrayProjectorMenu();
 
 	trayMenu->addAction(showHide);