xwayland: remove saved_{width,height}

This has been introduced way back in
be297d9d14 but is never used anywhere.

If compositors want to save the old dimensions before reacting to a
fullscreen or maximize event they can just grab the sizes within their
event handlers instead.

include/wlr/xwayland/xwayland.h

@@ -118,7 +118,6 @@ struct wlr_xwayland_surface {
 
 	int16_t x, y;
 	uint16_t width, height;
-	uint16_t saved_width, saved_height;
 	bool override_redirect;
 
 	char *title;

xwayland/xwm.c

@@ -1394,29 +1394,14 @@ static void xwm_handle_net_wm_state_message(struct wlr_xwm *xwm,
 	// all other values are set to 0
 
 	if (fullscreen != xsurface->fullscreen) {
-		if (xsurface->fullscreen) {
-			xsurface->saved_width = xsurface->width;
-			xsurface->saved_height = xsurface->height;
-		}
-
 		wl_signal_emit_mutable(&xsurface->events.request_fullscreen, NULL);
 	}
 
 	if (maximized != xsurface_is_maximized(xsurface)) {
-		if (xsurface_is_maximized(xsurface)) {
-			xsurface->saved_width = xsurface->width;
-			xsurface->saved_height = xsurface->height;
-		}
-
 		wl_signal_emit_mutable(&xsurface->events.request_maximize, NULL);
 	}
 
 	if (minimized != xsurface->minimized) {
-		if (xsurface->minimized) {
-			xsurface->saved_width = xsurface->width;
-			xsurface->saved_height = xsurface->height;
-		}
-
 		struct wlr_xwayland_minimize_event minimize_event = {
 			.surface = xsurface,
 			.minimize = xsurface->minimized,