qml: don't apply ElListView deadzones on Linux desktop

otherwise I can't click on list items if the window is moved too far to the right :O

follow-up 583afefe33

Note: on modern Android, apps don't always run full-screen.
      You can pop them out into small windows and move them.
      Haven't tested how the deadzones work then though.

electrum/gui/qml/components/controls/ElListView.qml

@@ -26,13 +26,15 @@ ListView {
     // android back gesture is used
     function layoutExclusionZones() {
         var reserve = constants.fingerWidth / 2
-        var p = root.mapToGlobal(0, 0)
+        var p = root.mapToGlobal(0, 0)  // note: coords on whole *screen*, not just window
         width_left_exclusion_zone = Math.max(0, reserve - p.x)
         p = root.mapToGlobal(width, 0)
         width_right_exclusion_zone = Math.max(0, reserve - (app.width - p.x))
     }
 
     Component.onCompleted: {
-        layoutExclusionZones()
+        if (AppController.isAndroid()) {
+            layoutExclusionZones()
+        }
     }
 }