mashu: Work around libinput stuff in phosh

hosts/mashu.nix

@@ -53,6 +53,10 @@ in mkHost config {
     services.logind.extraConfig = ''
       HandlePowerKey=suspend
     '';
+    services.xserver.libinput.touchpad = {
+      tapping = true;
+      disableWhileTrying = true;
+    };
     systemd.user.services = {
       gsd-media = {
         description = "GSD media keys handling";