chore(.librarian): fix state.yaml (googleapis#13078)

Fix batch add apiv1/iam_policy_client.go to preserve_regex.

Author: quartzmo

.librarian/state.yaml

@@ -521,10 +521,10 @@ libraries:
     source_roots:
       - batch
       - internal/generated/snippets/batch
-    preserve_regex: []
+    preserve_regex:
+      - ^batch/apiv1/iam_policy_client\.go$
     remove_regex:
       - ^internal/generated/snippets/batch/
-      - ^batch/apiv1/iam_policy_client\.go$
       - ^batch/apiv1/[^/]*_client\.go$
       - ^batch/apiv1/[^/]*_client_example_go123_test\.go$
       - ^batch/apiv1/[^/]*_client_example_test\.go$