admin: Inline restricted user role name

It was a variable only for the benefit of translators while disabled.

snikket_web/admin.py

@@ -63,9 +63,6 @@ async def users() -> str:
     )
 
 
-_LIMITED_ROLE_NAME = _("Limited")
-
-
 class EditUserForm(BaseForm):
     localpart = wtforms.StringField(
         _l("Login name"),
@@ -78,7 +75,7 @@ class EditUserForm(BaseForm):
     role = wtforms.RadioField(
         _l("Access Level"),
         choices=[
-            ("prosody:restricted", _LIMITED_ROLE_NAME),
+            ("prosody:restricted", _("Limited")),
             ("prosody:normal", _l("Normal user")),
             ("prosody:admin", _l("Administrator")),
         ],