Vitrage: typo in precheck task

Change-Id: If45d4877c3fa125a3abc71f0a84883fad0a0cf6e
Closes-Bug: 1853011

ansible/roles/vitrage/tasks/precheck.yml

@@ -17,7 +17,7 @@
     - inventory_hostname in groups['vitrage-api']
 
 - name: Checking custom prometheus_conf.yaml exists
-  local_action: stat_path="{{ node_custom_config }}/vitrage/prometheus_conf.yaml"
+  local_action: stat path="{{ node_custom_config }}/vitrage/prometheus_conf.yaml"
   register: result
   run_once: true
   failed_when: not result.stat.exists