AT converter: remove obsolete code

MC-true pdg code field was removed from VtxTracks branch long back in time (since this information is available via AT::Matching), but commented piece of code and empty (filled with zeros) field mc_pdg remained. This MR fixes this.

added 3 commits

• 3fe8dd7c - adapt ATKFParticleFinder to previous commit
• 3a43f49a - remove more obsolete lines
• 8918bdb3 - apply clang format

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added 1 commit

• 01542203 - fix bug of prev. commit with Matching init

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Dear @i.selyuzhenkov,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged