Fix showing unsupported window controls on Linux Wayland (#50609)

Release Notes:

- Fixed showing unsupported window controls on Linux Wayland

Before:
<img width="207" height="84" alt="image"
src="https://github.com/user-attachments/assets/174d3488-7c40-4b36-a1b5-76b85e19b796"
/>

After:
<img width="185" height="90" alt="image"
src="https://github.com/user-attachments/assets/82f10cbb-a834-4db9-a8e7-9e5156b3397e"
/>

Co-authored-by: Ben Kunkle <ben@zed.dev>

crates/gpui_linux/src/linux/wayland/window.rs

@@ -774,7 +774,12 @@ impl WaylandWindowStatePtr {
                 }
             }
             xdg_toplevel::Event::WmCapabilities { capabilities } => {
-                let mut window_controls = WindowControls::default();
+                let mut window_controls = WindowControls {
+                    maximize: false,
+                    minimize: false,
+                    fullscreen: false,
+                    window_menu: false,
+                };
 
                 let states = extract_states::<xdg_toplevel::WmCapabilities>(&capabilities);