fmf: Avoid mozilla-openh264
fmf: Avoid mozilla-openh264

mozilla-openh264 has been uninstallable in Rawhide for weeks. Let's
avoid this recommendation by disabling the fedora-cisco-openh264
repository. We don't need the codec anyway for our tests.

See https://bugzilla.redhat.com/show_bug.cgi?id=2005760

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