remove duplicate 'additionalPrinterColumns' (#14653)

Signed-off-by: Kenny Leung <kleung@chainguard.dev>
Co-authored-by: Kenny Leung <kleung@chainguard.dev>

Author: knative-prow-robot

config/core/300-resources/domain-mapping.yaml

@@ -150,16 +150,6 @@ spec:
                 url:
                   description: URL is the URL of this DomainMapping.
                   type: string
-      additionalPrinterColumns:
-        - name: URL
-          type: string
-          jsonPath: .status.url
-        - name: Ready
-          type: string
-          jsonPath: ".status.conditions[?(@.type=='Ready')].status"
-        - name: Reason
-          type: string
-          jsonPath: ".status.conditions[?(@.type=='Ready')].reason"
   names:
     kind: DomainMapping
     plural: domainmappings