Muon.Id bugfix + charge flip SF updates

Merged Sara Alderweireldt requested to merge salderwe/athena:ST/ECIDs_CFlip into 21.2


Note: CI will fail as below until references are synced to cvmfs at 18:18.

< SUSYObjDef_xAOD          WARNING Your Electron ID WP (LooseAndBLayerLLH) is not supported for charge ID SFs, falling back to MediumLLH for SF purposes

tagging: @janders, @oducu, @jojungge

Edited by Sara Alderweireldt

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