Wayland: Fix self.qtile startup logic

In qtile#4757 we have fixed some of the logic with regards to setting
self.qtile. This means that in certain scenarios the self.qtile
attribute does not exist, e.g. when we're adding keyboards befor the
config is loaded.

We already mark these devices as "pending" if
self.qtile is `None`, but this now does not work as the attribute is not
set in the first place. Let's check with hasattr and remove the
unneeded self.qtile setting inside of the keyboard constructor.

This fixes qtile#4767

libqtile/backend/wayland/core.py

@@ -446,7 +446,7 @@ def _on_new_input(self, _listener: Listener, wlr_device: input_device.InputDevic
         self.seat.set_capabilities(capabilities)
 
         logger.info("New device: %s %s", *device.get_info())
-        if self.qtile:
+        if hasattr(self, "qtile"):
             if self.qtile.config.wl_input_rules:
                 device.configure(self.qtile.config.wl_input_rules)
         else:

libqtile/backend/wayland/inputs.py

@@ -207,7 +207,6 @@ def configure(self, configs: dict[str, InputConfig]) -> None:
 class Keyboard(_Device):
     def __init__(self, core: Core, wlr_device: InputDevice, keyboard: WlrKeyboard):
         super().__init__(core, wlr_device)
-        self.qtile = core.qtile
         self.seat = core.seat
         self.keyboard = keyboard
         self.grabbed_keys = core.grabbed_keys