Update PiP rule

Author: c4software

archlinux/install/tilling/config/niri/includes/window-rules.kdl

@@ -3,10 +3,7 @@
 // ============================================================================
 
 window-rule {
-    // This app-id regular expression will work for both:
-    // - host Firefox (app-id is "firefox")
-    // - Flatpak Firefox (app-id is "org.mozilla.firefox")
-    match app-id=r#"firefox$"# title="^Picture-in-Picture$"
+    match title="^Picture-in-Picture$"
     open-floating true
 }