Deduplicate some state

src/output.zig

@@ -268,7 +268,7 @@ pub const Output = struct {
             while (it) |node| : (it = node.prev) {
                 const layer_surface = &node.data;
                 // Only mapped surfaces may gain focus
-                if (layer_surface.mapped and
+                if (layer_surface.wlr_layer_surface.mapped and
                     layer_surface.wlr_layer_surface.current.keyboard_interactive)
                 {
                     break :outer layer_surface;