Fix to ftag-grid-sub.sh to remove duplicates
Added in OPTS+=" --nGBPerJob=MAX" as recommended in https://twiki.cern.ch/twiki/bin/view/AtlasComputing/SoftwareTutorialxAODAnalysisInCMake and https://twiki.cern.ch/twiki/bin/view/PanDA/PandaRun#Error%20when%20--n_GBPerJob%20is%20used.
Removed OPTS+=" --nEventsPerJob=25000 " as it was causing duplicate events to occur.