InDetTrigTrackSlimmer: Use ITrackSlimmingTool::slimCopy().
Change TrigTrackSlimmer to use the slimCopy() method of ITrackSlimmingTool rather than slim.
Avoids thread-safety issues.
Change TrigTrackSlimmer to use the slimCopy() method of ITrackSlimmingTool rather than slim.
Avoids thread-safety issues.