Tray: fix screen access that does not exists on first load.

Modules/Bar/Extras/TrayMenu.qml

@@ -8,13 +8,15 @@ import qs.Widgets
 
 PopupWindow {
   id: root
+
+  property ShellScreen screen
+
   property var trayItem: null
   property var anchorItem: null
   property real anchorX
   property real anchorY
   property bool isSubMenu: false
   property bool isHovered: rootMouseArea.containsMouse
-  property ShellScreen screen
   property string widgetSection: ""
   property int widgetIndex: -1
 
@@ -45,7 +47,7 @@ PopupWindow {
   implicitWidth: menuWidth
 
   // Use the content height of the Flickable for implicit height
-  implicitHeight: Math.min(screen.height * 0.9, flickable.contentHeight + (Style.marginS * 2))
+  implicitHeight: Math.min(screen?.height * 0.9, flickable.contentHeight + (Style.marginS * 2))
   visible: false
   color: Color.transparent
   anchor.item: anchorItem