better crop region handling, but coordinate math is wrong

Modules/Settings/Categories/Background.qml

@@ -1,3 +1,4 @@
+import Quickshell
 import QtQuick.Layouts
 import qs.Modules.Settings.Controls
 import qs.Config
@@ -5,6 +6,8 @@ import qs.Config
 SettingsPage {
 	id: root
 
+	required property ShellScreen screen
+
 	SettingsSection {
 		sectionId: "Wallpaper"
 
@@ -35,6 +38,7 @@ SettingsPage {
 		WallpaperCropper {
 			Layout.fillWidth: true
 			Layout.preferredHeight: 600
+			screen: root.screen
 		}
 	}