update taskD0.cxx

Removed unused filterD0Flag variable from taskD0.cxx.

Author: phymanshu

PWGHF/D2H/Tasks/taskD0.cxx

@@ -125,9 +125,7 @@ struct HfTaskD0 {
   using TracksSelQuality = soa::Join<aod::TracksExtra, aod::TracksWMc>;
   using TracksWPid = soa::Join<o2::aod::FullTracks, aod::TracksDCA, o2::aod::TrackSelection, aod::TracksPidPi, aod::PidTpcTofFullPi, aod::TracksPidKa, aod::PidTpcTofFullKa, aod::TracksPidPr, aod::PidTpcTofFullPr>;
   // using TracksWithExtra = o2::soa::Join<o2::aod::FullTracks, o2::aod::TrackSelection>;
-
   Filter filterD0Flag = (o2::aod::hf_track_index::hfflag & static_cast<uint8_t>(BIT(aod::hf_cand_2prong::DecayType::D0ToPiK))) != static_cast<uint8_t>(0);
-  
   Preslice<TracksWPid> perCol = aod::track::collisionId;
   Preslice<aod::HfCand2Prong> candD0PerCollision = aod::hf_cand::collisionId;