Bugfix: descend focus stack on new window focus

When switching back to a workspace after new window creation, it is now
necessary to descend the focus stack into the focused container of the
workspace to determine which container should get the focus. This is because
the `set_focused_container()` function no longer automatically descends into
the focus stack to find the correct view to focus.

sway/handlers.c

@@ -415,7 +415,7 @@ static bool handle_view_created(wlc_handle handle) {
 		// we were on one workspace, switched to another to add this view,
 		// now let's return to where we were
 		workspace_switch(current_ws);
-		set_focused_container(current_ws->focused);
+		set_focused_container(get_focused_container(current_ws));
 	}
 
 	suspend_workspace_cleanup = false;