Remove unused PxPyPzM4D header

Removed unnecessary PxPyPzM4D header include.

Author: sustripathy

PWGLF/Tasks/Resonances/f0phiproxy.cxx

@@ -31,7 +31,6 @@
 #include <Framework/runDataProcessing.h>
 
 #include <Math/GenVector/LorentzVector.h>
-#include <Math/GenVector/PxPyPzM4D.h>
 #include <Math/Vector4Dfwd.h>
 
 #include <cmath>