Resolve BMK-41 Fixing firstEvent argument in Generate_tf.py

Closes BMK-41 Setting --firstEvent argument in Generate_tf.py command to "1". Previously --firstEvent="47060001" has been used.

atlas/gen/atlas-gen/atlas-gen-bmk.sh

@@ -21,7 +21,7 @@ function doOne(){
   # Configure WL copy
   joboptions=$BMKDIR/auxfiles/MC15.410501.PowhegPythia8EvtGen_A14_ttbar_hdamp258p75_nonallhad.py
   # Execute WL copy
-  Generate_tf.py --ecmEnergy="13000"  --firstEvent="47060001" --jobConfig="$joboptions" \
+  Generate_tf.py --ecmEnergy="13000"  --firstEvent="1" --jobConfig="$joboptions" \
     --maxEvents="$NEVENTS_THREAD" --outputEVNTFile="EVNT.10867034._003922.pool.root.1" --outputTXTFile="TXT.10867034._003922.tar.gz.1" \
     --randomSeed="9413" --runNumber="410501"  > out_$1.log 2>&1
   status=${?}