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Ensuring MC event number is set in derivations

Zach Marshall requested to merge zmarshal/athena:21.2_MCEventNumberFix into 21.2

When derivations are made from EVNT files, we often encounter a situation where the MC event number is not yet set, though the event number is. This patch ensures that the MC event number in the xAOD event info will be set to something sensible in such cases. No change, of course, to the cases that were fine before.

@ewelina and @lcorpe (and maybe @jchapman ): it'd be great if we can ensure this sort of thing doesn't come up, but for now this patch will get us around the problem.

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