[Web] Remove SOGo admin login hint (#4100)

* Remove old SOGo Admin Login hint

* Remove unneeded code blocks after change

data/web/lang/lang.es.json

@@ -772,4 +772,4 @@
         "fuzzy_learn_error": "Error aprendiendo hash: %s",
         "ip_invalid": "IP inválida omitida: %s"
     }
-}
+}