Fix crash when moving a container to a fullscreen workspace

Setting normal focus to the fullscreen view causes the old workspace to
start destroying. We then set focus to the old workspace which is no
longer attached in the tree.

As we are only setting focus_inactive on the fullscreen container, the
fix uses seat_set_raw_focus to avoid all the additional behaviour that
comes with it such as destroying the old workspace.

sway/commands/move.c

@@ -108,7 +108,7 @@ static void workspace_focus_fullscreen(struct sway_workspace *workspace) {
 		if (focus_ws == workspace) {
 			struct sway_node *new_focus =
 				seat_get_focus_inactive(seat, &workspace->fullscreen->node);
-			seat_set_focus(seat, new_focus);
+			seat_set_raw_focus(seat, new_focus);
 		}
 	}
 }