[6/6] introspection: remove disused argument

[hdonnay]

Stack:

• https://github.com/quay/clair/pull/2101
• https://github.com/quay/clair/pull/2102
• https://github.com/quay/clair/pull/1817
• https://github.com/quay/clair/pull/2103
• https://github.com/quay/clair/pull/2104
• https://github.com/quay/clair/pull/1974

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introspection: remove disused argument

This is replaced by the metrics-powered health check.

Signed-off-by: Hank Donnay hdonnay@redhat.com