Fixes in the muon segment cleaner

Patrick Scholerrequested to merge
pscholer/athena:fixNSWSegmentCleaner into 21.3

Hi, this MR forces the MuonTrackCleaner, used in the NSW segment finder, to use straight line fits instead of curved fits. See ATLASRECTS-5535.

Changes are done on behalf of @kluit

Edited by Patrick Scholer

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