ecamp3-logging: switch back to fluent-operator image

They use ghcr.io/fluent/fluent-operator/fluentd:v1.17.0 with v2.9.0,
which seems to work again.

closes ecamp#5320

Author: BacLuc

.ops/ecamp3-logging/values.yaml

@@ -19,9 +19,6 @@ fluent-operator:
     watchedNamespaces:
       - default
       - ingress-nginx
-    image: 
-      repository: bacluc/fluentd
-      tag: 1.15.3
     enable: true
 
 fluentd: