only_image_publish.yaml: Remove KOKKURI_REGISTRY_INTERNAL variable
As of Kokkuri version 2.3.1, the default value of
KOKKURI_REGISTRY_INTERNAL is the value of KOKKURI_REGISTRY_PUBLIC,
so remove the now-redundant variable definitions.
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As of Kokkuri version 2.3.1, the default value of
KOKKURI_REGISTRY_INTERNAL is the value of KOKKURI_REGISTRY_PUBLIC,
so remove the now-redundant variable definitions.