Multiply vertex time coordinate by speed of light in VertexBeamCondPositioner
Follow up to !65933 (merged) and ATLSWUPGR-215
Relevant for Run 4 samples only, since Run 3 samples don't use time smearing
Follow up to !65933 (merged) and ATLSWUPGR-215
Relevant for Run 4 samples only, since Run 3 samples don't use time smearing