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fix sign of polarity in seeding and matching

Christina Agapopoulou requested to merge matching_fix_sign into master

Fix sign of tracks reconstructed from seeding & matching. A wrong sign assignment was introduced with the change of parametrization in !1098 (merged) . The sign reversal was universal, so at the time rates of lines with OS requirements were unaffected. The issue was observed from @mstahl when running hlt1_pp_forward_then_matching sequence where Lambdas were mostly reconstructed as same-sign (probably with one "forward" proton and one "matching" pion with the wrong sign).

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