xdg-shell: remove unnecessary return

We're at the end of the function anyways.

types/xdg_shell/wlr_xdg_toplevel.c

@@ -147,7 +147,6 @@ void handle_xdg_toplevel_committed(struct wlr_xdg_toplevel *toplevel) {
 				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_FULLSCREEN |
 				WLR_XDG_TOPLEVEL_WM_CAPABILITIES_MINIMIZE);
 		}
-		return;
 	}
 }