Remove hardcodded namespace from wait.sh

The wait.sh script that is creating the external-secrets-wait-job-store SecretStore has the namespace hardcoded to external-secrets. Which can only be overwritten via a postrender patch. Can the 2 hardcoded namespaces (line 10 & line 17) be templated to allow the end user to pass in the namespace via values file? Otherwise, this will fail for a user that has external-secrets deployed in a different namespace, because the external-secrets namespace will not exist.