refactor: remove localLoginLabel (#1905)

Removing deprecated key "localLoginLabel" from default config file.

Author: GBirkel

CI/e2e/frontend.config.e2e.json

@@ -18,7 +18,6 @@
   "loginFacilityEnabled": true,
   "loginLdapEnabled": true,
   "loginLocalEnabled": true,
-  "localLoginLabel": "Local",
   "fileColorEnabled": true,
   "fileDownloadEnabled": true,
   "gettingStarted": null,