fix apps menu not closing when the window is hidden, and make group folders menu work again

this change resolves this ReferenceError when the window is being closed:
```
2025-01-08 10:56:40:389 [ warning default qrc:/qml/src/gui/tray/MainWindow.qml:100 ]:   qrc:/qml/src/gui/tray/MainWindow.qml💯 ReferenceError: appsMenu is not defined
```

I also noticed that the "Open local or group folders" dropdown menu
wouldn't show up due to this error:
```
2025-01-08 10:56:23:327 [ warning default qrc:/qml/src/gui/tray/TrayFoldersMenuButton.qml:33 ]: qrc:/qml/src/gui/tray/TrayFoldersMenuButton.qml:33: Error: Cannot call method QQuickPopup::open on QQuickLoader_QML_48(0x5569fb4648d0)
```
--> wrapped the calls to the open/close methods in a closure

Signed-off-by: Jyrki Gadinger <nilsding@nilsding.org>

src/gui/tray/MainWindow.qml

@@ -100,8 +100,8 @@ ApplicationWindow {
 
             if (Systray.isOpen) {
                 trayWindowHeader.currentAccountHeaderButton.accountMenu.close();
-                appsMenu.close();
-                openLocalFolderButton.closeMenu()
+                trayWindowHeader.appsMenu.close();
+                trayWindowHeader.openLocalFolderButton.closeMenu()
             }
         }
 

src/gui/tray/TrayFoldersMenuButton.qml

@@ -222,8 +222,8 @@ HeaderButton {
             }
 
             Component.onCompleted: {
-                foldersMenuLoader.openMenu = open
-                foldersMenuLoader.closeMenu = close
+                foldersMenuLoader.openMenu = function() { open() }
+                foldersMenuLoader.closeMenu = function() { close() }
             }
 
             Connections {

src/gui/tray/TrayWindowHeader.qml

@@ -26,6 +26,8 @@ Rectangle {
     id: root
 
     readonly property alias currentAccountHeaderButton: currentAccountHeaderButton
+    readonly property alias openLocalFolderButton: openLocalFolderButton
+    readonly property alias appsMenu: appsMenu
 
     color: Style.currentUserHeaderColor