Maximize xdg shell surfaces on creation

Makes them look better yo

In the future we might want to only do this for tiled windows, and let
floating windows do their own thing.

sway/desktop/xdg_shell_v6.c

@@ -102,6 +102,7 @@ void handle_xdg_shell_v6_surface(struct wl_listener *listener, void *data) {
 	wlr_log(L_DEBUG, "New xdg_shell_v6 toplevel title='%s' app_id='%s'",
 			xdg_surface->toplevel->title, xdg_surface->toplevel->app_id);
 	wlr_xdg_surface_v6_ping(xdg_surface);
+	wlr_xdg_toplevel_v6_set_maximized(xdg_surface, true);
 
 	struct sway_xdg_surface_v6 *sway_surface =
 		calloc(1, sizeof(struct sway_xdg_surface_v6));