Only reset compression if its not valid

[Jamstah]

If we reset the default compression method, force compression no longer works.

Fixes containers/podman#23942
Podman test containers/podman#24673

[Jamstah]

@mtrmac Hi Miroslav, long time :)

I think the failure in the podman test PR is an infra failure, but if I'm wrong lmk and I'll try and work out what happened.

[Luap99]

Yes the one podman test failure can be ignored as it is a flake and totally unrelated to this code.
I leave it to @mtrmac to comment on the code here

[mtrmac]

Thanks!

Logic LGTM; it would be best to see containers/podman#24673 be reviewed and mostly-pass before merging this.

[openshift-ci]

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[Jamstah]

Review comments addressed and push to both PRs for testing.

[mtrmac]

LGTM. Note to self: Merge after the test PR passes.

Thanks!