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tauRecTools: Fix handling of neutral pions and kaons in TauTruthMatching

This MR fixes the truth tau logic for unstable decay products, in particular neutral pions and kaons. This was initially reported here: https://its.cern.ch/jira/browse/ATLTAU-1624

Pinging @cgrefe, @stsuno, @martindl, @adbailey and @fscutti fyi.

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