frontend: Enable use of delete key on macOS

While it is canonical to use the backspace key as an alternative to the
dedicated "delete" key (which is omitted on many smaller-sized Apple
keyboards), the delete key is still available on full-size Apple
keyboards and obviously third-party keyboards.

This change adds the delete key as an alternative to the backspace key
to allow removal of scene items from the scene list in the UI.

Author: PatTheMav

frontend/widgets/OBSBasic.cpp

@@ -471,8 +471,8 @@ OBSBasic::OBSBasic(QWidget *parent) : OBSMainWindow(parent), undo_s(ui), ui(new
 	renameScene->setShortcut({Qt::Key_Return});
 	renameSource->setShortcut({Qt::Key_Return});
 
-	ui->actionRemoveSource->setShortcuts({Qt::Key_Backspace});
-	ui->actionRemoveScene->setShortcuts({Qt::Key_Backspace});
+	ui->actionRemoveSource->setShortcuts({Qt::Key_Backspace, Qt::Key_Delete});
+	ui->actionRemoveScene->setShortcuts({Qt::Key_Backspace, Qt::Key_Delete});
 
 	ui->actionCheckForUpdates->setMenuRole(QAction::AboutQtRole);
 	ui->action_Settings->setMenuRole(QAction::PreferencesRole);