[test] update route handler allowlist expectation

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: KaiSernLim

services/venice-controller/src/test/java/com/linkedin/venice/controller/server/TestVeniceRouteHandler.java

@@ -57,7 +57,7 @@ public void internalHandle(Request request, ControllerResponse veniceResponse) {
     ControllerResponse veniceResponse =
         ObjectMapperFactory.getInstance().readValue(veniceResponseStr, ControllerResponse.class);
     verify(response).status(HttpStatus.SC_FORBIDDEN);
-    Assert.assertEquals(veniceResponse.getErrorType(), ErrorType.BAD_REQUEST);
+    Assert.assertEquals(veniceResponse.getErrorType(), ErrorType.ACL_ERROR);
     Assert.assertEquals(veniceResponse.getExceptionType(), ExceptionType.BAD_REQUEST);
   }
 }