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Fix xAOD::TruthVertex matching logic in InDetSecVtxTruthMatchTool

John Derek Chapman requested to merge jchapman/athena:BugfixInDetSecVtxTruthMatchTool_main into main

Fix logic in InDetSecVtxTruthMatchTool::matchVertices and InDetSecVtxTruthMatchTool::checkProduction.

Valid truth vertex barcode/id values are negative integers. This code was using the value -1 to indicate "no match", but this value is a possibly correct vertex barcode, so some actual matches could have been ignored. The code has been updated to use HepMC::INVALID_VERTEX_ID (=1) instead.

FYI @ncalace, @cgrefe, @vkost

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