fixed ntuple file name in test_davinci_tupling_tistos

DaVinciExamples/tests/qmtest/tupling.qms/test_davinci_tupling_tistos.qmt

@@ -19,7 +19,8 @@
   </set></argument>
   <argument name="options_yaml_fn"><text>$DAVINCIEXAMPLESROOT/example_data/test_tistos.yaml</text></argument>
   <argument name="extra_options_yaml"><text>
-    ntuple_file: tuple_tistos.root
+    histo_file: tistos_histos.root
+    ntuple_file: tistos_ntuple.root
     print_freq: 1
   </text></argument>
   <argument name="reference"><text>../refs/test_davinci_tupling_tistos.ref</text></argument>
@@ -39,7 +40,7 @@ B_vars_stored += ['RUNNUMBER', 'EVENTNUMBER']
 B_vars_stored = sorted(B_vars_stored)
 
 #open the TFile and TTree
-ntuple = './tuple_tistos.root'
+ntuple = './tistos_ntuple.root'
 if not os.path.isfile(ntuple): raise Exception(f"File: {ntuple} does not exist!")
 f      = TFile.Open(ntuple)
 t_B    = f.Get('Tuple/DecayTree')