Fix test definition after making runHLT_standalone_newJO.py an executable (ATR-25102)
Fix the test failure:
python: can't open file '/builds/art/art-submit/art-local/master/Athena/x86_64-centos7-gcc11-opt/2022-03-06T2101/TriggerTest/test_trig_mc_newJO_build/runHLT_standalone_newJO.py': [Errno 2] No such file or directory
https://atlas-art-data.web.cern.ch/atlas-art-data/local-output/master/Athena/x86_64-centos7-gcc11-opt/2022-03-06T2101/TriggerTest/test_trig_mc_newJO_build/athena.log that I missed in !50842 (merged)