hyprland: Attempt to use hide on touch feature

This worked but broke when changing the display from e.g. 200% scaling
to 100% scaling. Since being able to easily change the scaling of
Hyprland was one of the main reasons I wanted to try Hyprland over
Phosh, I don't really have a use case for Hyprland on touch devices at
this moment, especially with all the drawbacks of using it on such a
small screen and without hardware acceleration.

home/hyprland.nix

@@ -152,6 +152,10 @@ in
         workspace_swipe_cancel_ratio = 0.15;
       };
 
+      cursor = {
+        hide_on_touch = true;
+      };
+
       device = [
         {
           name = "synps/2-synaptics-touchpad";