[charts/gateway] DE606668 Helm chart otk Installation failing with error

[ab-sub]

Description of the change

fixing issue to provide backward compatibility to install 4.6 from newer chart versions

Benefits

Drawbacks

Applicable issues

• fixes #DE606668

Additional information

Checklist

• [X] Chart version bumped in Chart.yaml according to semver.
• [X] Variables are documented in the README.md
• [X] Title of the PR starts with chart name (e.g. [charts/gateway])
• [X] If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files