Change RBAC value to false on Prometheus values.yml

- This will allow to install Prometheus again without a problem

Closes #43621

changelogs/unreleased/43261-fix-prometheus-installation.yml

+---
+title: Allow Prometheus application to be installed from Cluster applications
+merge_request: 17372
+author:
+type: fixed

vendor/prometheus/values.yaml

@@ -10,6 +10,9 @@ nodeExporter:
 pushgateway:
   enabled: false
 
+rbac:
+  create: false
+
 server:
   image:
     tag: v2.1.0