fix whitespace

Author: Sabrina Hernandez

PWGCF/Flow/Tasks/FlowZDCtask.cxx

@@ -83,7 +83,7 @@ struct FlowZDCtask {
   Configurable<float> acceptanceZnc{"acceptanceZnc", 0.90, "ZNC acceptance factor"};
   Configurable<float> acceptanceZpa{"acceptanceZpa", 0.52, "ZPA acceptance factor"};
   Configurable<float> acceptanceZpc{"acceptanceZpc", 0.50, "ZPC acceptance factor"};
-  
+
   ConfigurableAxis axisVertex{"axisVertex", {20, -10, 10}, "vertex axis for histograms"};
   ConfigurableAxis axisPhi{"axisPhi", {60, 0.0, constants::math::TwoPI}, "phi axis for histograms"};
   ConfigurableAxis axisEta{"axisEta", {40, -1., 1.}, "eta axis for histograms"};