RecJobTransformTests: Remove return statement that causes script error
The RecJobTransformTests ART test all show up as failed on http://atlas-computing.web.cern.ch/atlas-computing/links/distDirectory/gitwww/GITWebArea/nightlies/master/2019-11-20T2131/Athena/x86_64-centos7-gcc8-opt/Athena//art.log.html
AFAICS, most of the tests actually succeed but the shell complains about a spurious return statement in the script. This MR removes this return statement.