Remove docmanager-extension:recents plugin

Mirrors PR jupyter/notebook#7307

Author: jitseniesen

spyder_notebook/server/app/package.json

@@ -227,7 +227,9 @@
         "@jupyterlab/htmlviewer-extension": true,
         "@jupyterlab/imageviewer-extension": true,
         "@jupyterlab/lsp-extension": true,
-        "@jupyterlab/mainmenu-extension": true,
+        "@jupyterlab/mainmenu-extension": [
+          "@jupyterlab/mainmenu-extension:plugin"
+        ],
         "@jupyterlab/markedparser-extension": true,
         "@jupyterlab/mathjax-extension": true,
         "@jupyterlab/notebook-extension": [