fix vmssflex test failure#3

Author: andyzhangx

config/jobs/kubernetes-sigs/azuredisk-csi-driver/azuredisk-csi-driver-config.yaml

@@ -627,7 +627,7 @@ presubmits:
             - name: TEST_CCM  # CAPZ config
               value: "true"
             - name: ENABLE_TOPOLOGY  # CAPZ config
-              value: "false"
+              value: "true"
             - name: TEST_VMSS_FLEX  # azuredisk-csi-driver config
               value: "true"
             - name: CONTROL_PLANE_MACHINE_COUNT  # CAPZ config