Replace hard-coded ```0.5696``` with ```bfield_*c_/2``` in ```L1TrackObjectNtupleMaker```

[brandiskip]

https://github.com/cms-L1TK/cmssw/blob/L1TK-dev-15_1_0_pre4/L1Trigger/L1TTrackMatch/test/L1TrackObjectNtupleMaker.cc#L2925

https://github.com/cms-L1TK/cmssw/blob/L1TK-dev-15_1_0_pre4/L1Trigger/L1TTrackMatch/test/L1TrackObjectNtupleMaker.cc#L3045

Magic number 0.5696 should be replaced with:
bfield_ * c_ / 2

Will need to add:

#include "L1Trigger/TrackFindingTracklet/interface/Settings.h"

trklet::Settings settings;
double bfield_ = settings.bfield();
double c_ = settings.c();