refactor: change PopupSurface args to PopupKind of position_popup_within_rect() paths

- to support InputMethod popup kind in later commit

src/wayland/handlers/layer_shell.rs

@@ -40,7 +40,10 @@ impl WlrLayerShellHandler for State {
     }
 
     fn new_popup(&mut self, _parent: WlrLayerSurface, popup: PopupSurface) {
-        self.common.shell.read().unconstrain_popup(&popup);
+        self.common
+            .shell
+            .read()
+            .unconstrain_popup(&PopupKind::from(popup.clone()));
 
         if let Err(err) = popup.send_configure() {
             tracing::warn!("Unable to configure popup. {err:?}",);