view: Call view_moved() immediately after map

At least for XWayland surfaces, handle_commit() is not always
called after map(), and as a result, the scene-graph node is never
positioned.

Not sure 100% if the same can occur with XDG surfaces, but the
extra view_moved() call should be harmless, so add it there too
for consistency.

src/xdg.c

@@ -307,7 +307,7 @@ xdg_toplevel_view_map(struct view *view)
 			view_maximize(view, true);
 		}
 
-		view_discover_output(view);
+		view_moved(view);
 		view->been_mapped = true;
 	}