Change JupyterLab default windowing mode to defer (#3055)

Author: marcelovilla

src/_nebari/stages/kubernetes_services/template/modules/kubernetes/services/jupyterhub/files/jupyterlab/overrides.json

@@ -122,5 +122,8 @@
                 ]
             }
         ]
+    },
+    "@jupyterlab/notebook-extension:tracker" : {
+        "windowingMode": "defer"
     }
 }