fix(auth): error num 401 for oauth

Lewis: May this revision serve well! <lu5a@proton.me>

crates/tranquil-pds/src/auth/mod.rs

@@ -522,7 +522,7 @@ async fn validate_bearer_token_with_options_internal(
                 auth_source: AuthSource::OAuth,
             });
         } else {
-            return Err(TokenValidationError::TokenExpired);
+            return Err(TokenValidationError::OAuthTokenExpired);
         }
     }