Set admin on false on logout

Author: Lenhard Reuter

learners/routes/authentication.py

@@ -49,4 +49,5 @@ def modify_token():
     success_msg = "Successfully logged out."
     cfg.template["authenticated"] = False
     cfg.template["vnc_clients"] = None
+    cfg.template["admin"] = None
     return render_template("login.html", **cfg.template, success_msg=success_msg)