Fix preInclude statement to keep only first measured parameters; ATLASRECTS-4062.

Change from keepParameters to keepFirstParameters flag in preInlcude of BLS stream reco.
to ensure only the first measured parameters are kept in the AOD.


Former-commit-id: 45269f7fc0c98389e03c01c329f5bbc3ab5e6e5c

Reconstruction/RecExample/RecExCommon/share/preIncludeForBLSStream.py

 #This is a preInclude file to be used to run the BLS stream in production.
 #Author: James Walder
 from InDetRecExample.InDetJobProperties import InDetFlags
-InDetFlags.KeepParameters.set_Value_and_Lock(True)
+InDetFlags.KeepFirstParameters.set_Value_and_Lock(True)
 InDetFlags.keepAdditionalHitsOnTrackParticle.set_Value_and_Lock(True)
 InDetFlags.cutLevel.set_Value_and_Lock(13)