replace ErrorKind::Forbidden with forbidden() non-exhaustive constructor

https://github.com/ruma/ruma/commit/917584e0cae4ae8642625f234f22f049bc159fee

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/client_server/directory.rs

@@ -110,7 +110,7 @@ pub async fn set_room_visibility_route(
 				);
 
 				return Err(Error::BadRequest(
-					ErrorKind::Forbidden,
+					ErrorKind::forbidden(),
 					"Publishing rooms to the room directory is not allowed",
 				));
 			}