ATLASRECTS-4687: Adding in LockMapCurrents for online, not copied over from field svc
adding in possibility to lock in the current values coming in with the map, i.e. force the scaling to just be 1.
Requested in https://its.cern.ch/jira/browse/ATLASRECTS-4687
by @fwinkl
Edited by Christos Anastopoulos