remove duplicate items from filebrowser toolbar

Author: DenisaCG

schema/widget.json

@@ -1,19 +1,11 @@
 {
   "jupyter.lab.toolbars": {
     "FileBrowser": [
-      {
-        "name": "new-directory",
-        "command": "filebrowser:create-new-directory",
-        "rank": 10
-      },
-      { "name": "uploader", "rank": 20 },
-      { "name": "refresh", "command": "filebrowser:refresh", "rank": 30 },
       {
         "name": "drive",
         "command": "drives:open-drives-dialog",
         "rank": 35
-      },
-      { "name": "fileNameSearcher", "rank": 40 }
+      }
     ]
   },
   "title": "'@jupyter/drives",