InvalidParameter exception for namespace configuration in the OKE Operator managed add-on

[SyNuOra]

The Oracle Kubernetes Engine Operator managed add-on throws an exception when attempting the add the namespace configuration.

In an attempt to update the WATCH_NAMESPACE, I only saw the namespace option available and attempted to use this but this does appear to be the actual namespace of the Operator.

When saving the option an exception is thrown, this option should be removed / replaced witht eh watch names as per the enhancement request in issue #191