Fix xAOD::EventInfo and xAOD::EventShape slimming

Tadej Novakrequested to merge
tadej/athena:slimming into master

Fix xAOD::EventInfo and xAOD::EventShape slimming. The python logic was a bit strange and I updated it to be more reasonable. Not sure if this is a proper fix for missing variables as reported in ATEAM-670.

Keeping it in Draft until @ssnyder has a look.

/cc @jcatmore

Edited by Tadej Novak

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