fix: remove no longer needed safeguard for enable_auth_state

Since we generate a key to encrypt/decrypt if needed, we don't need to
protect against trying to use enable_auth_state that requires such key
without explicitly specifying one.

jupyterhub/templates/NOTES.txt

@@ -111,12 +111,6 @@ directly instead.
 {{ "HARD DEPRECATION: proxy.pdb has renamed to proxy.chp.pdb" | fail }}
 {{- end }}
 
-{{- if include "jupyterhub.digToTrue" (list "hub.config.Authenticator.enable_auth_state" .Values) }}
-{{- if not (include "jupyterhub.digToTrue" (list "hub.config.CryptKeeper.keys" .Values)) }}
-{{ "Using Authenticator.enable_auth_state, you also need to CryptKeeper.keys to a list with at least one key in it." | fail }}
-{{- end }}
-{{- end }}
-
 {{- if .Values.auth }}
 {{ include "jupyterhub.authDep.remapOldToNew" . | fail }}
 {{- end }}