fix: fix auto-pagination field name

Author: yoshi-automation

packages/google-cloud-datacatalog/src/v1beta1/policy_tag_manager_client.ts

@@ -163,7 +163,7 @@ export class PolicyTagManagerClient {
       listPolicyTags: new gaxModule.PageDescriptor(
         'pageToken',
         'nextPageToken',
-        'policy_tags'
+        'policyTags'
       ),
     };