ui/input: remove double-notification on qemu_mouse_set()

qemu_input_handler_activate() already notifies.

Reviewed-by: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

ui/input.c

@@ -580,7 +580,6 @@ bool qemu_mouse_set(int index, Error **errp)
     }
 
     qemu_input_handler_activate(s);
-    notifier_list_notify(&mouse_mode_notifiers, NULL);
     return true;
 }