nixvim: fix filtered_items nesting under filesystem in neo-tree

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

modules/home/nixvim/plugins/ui/neo-tree.nix

@@ -4,12 +4,13 @@
       enable = true;
       settings = {
         close_if_last_window = true;
+
         filesystem = {
           follow_current_file = {
             enabled = true;
             leave_dirs_open = true;
           };
-        };
+
           filtered_items = {
             visible = true;
             hide_dotfiles = false;
@@ -32,4 +33,5 @@
         };
       };
     };
+  };
 }