[kong] Fix disabling KongClusterPlugin controller environment variable.

[johnharris85]

Signed-off-by: John Harris john.harris@konghq.com

What this PR does / why we need it:

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)
When deploying KIC with watchNamespaces set, the chart sets an incorrect environment variable so the KongClusterPlugin controller is not disabled, causing a CrashLoopBackOff.

Special notes for your reviewer:

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• PR is based off the current tip of the next branch and targets next, not main
• New or modified sections of values.yaml are documented in the README.md
• Title of the PR and commit headers start with chart name (e.g. [kong])

[CLAassistant]

All committers have signed the CLA.

[rainest]

LGTM. While this is awaiting release, please set env.ingressController.enable_controller_kongclusterplugin=false manually to work around the issue.