fixing header and maxEvents for jet reconstruction nightly tests

The edits to test_jet.sh in this MR make the necessary fixes so that nightly ART jobs run successfully. The header has removed the input file because we are reading the file directly from cvmfs nightlies. Also, the maxEvents in the test file may not always be 3000, so -1 is given as a precaution. @tcuhadar

Reconstruction/Jet/JetValidation/test/test_jet.sh

 #!/bin/sh
 # art-description: ART test job HITS to AOD
 # art-type: grid
-# art-input: mc16_13TeV.410470.PhPy8EG_A14_ttbar_hdamp258p75_nonallhad.simul.HITS.e6337_s3126
 # art-include: master/Athena
 # art-output: *.root
 
@@ -22,7 +21,7 @@ echo "Output Validation file : ${ART_Validation}"
 echo "Submitting Reconstruction ..."
 
 Reco_tf.py \
-    --maxEvents ${Nevents} \
+    --maxEvents -1 \
     --inputHITSFile=${HITSFile} \
     --outputAODFile=${ART_AOD} \
     --outputNTUP_PHYSVALFile ${ART_Validation} \