[bitnami/thanos] Remove quotes from --rule-file arg

[migruiz4]

Description of the change

Remove the quotes from the --rule-file arg.

The quotes were accidentally added at #31377.

Users are reporting the feature not working since the change.

Benefits

Reverts quotes change while keeping the feature added.

Possible drawbacks

None known.

Applicable issues

• fixes [bitnami/thanos] Ruler configmap not loading since chart 15.10.0 #31525

Additional information

The change is quite simple, I tested it using the following command:

$ helm install thanos bitnami/thanos --set ruler.enabled=true --set ruler.existingConfigmap=a --set objstoreConfig=b --set "ruler.alertmanagers[0]=c" --dry-run | grep rule-file
            - --rule-file=/conf/rules/*.yml
$ helm install thanos oci://registry-1.docker.io/bitnamicharts/thanos --set ruler.enabled=true --set ruler.existingConfigmap=a --set objstoreConfig=b --set "ruler.alertmanagers[0]=c" --dry-run | grep rule-file
            - --rule-file="/conf/rules/*.yml"

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)