bridge production: fix mtime matching

This is only matching files exactly 30 days older.  We want more than
30 days.

Change-Id: I9f04b217e0fd11ee0004ea60704fa2f4441ad89f

playbooks/zuul/run-production-playbook.yaml

@@ -61,5 +61,5 @@
           when: not infra_prod_playbook_collect_log
           become: yes
           shell: |
-            find /var/log/ansible -name '{{ playbook_name }}.log.*' -type f -mtime 30 -delete
+            find /var/log/ansible -name '{{ playbook_name }}.log.*' -type f -mtime +30 -delete