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Fix for rare issue with the MuonTrackScoringTool

William Axel Leight requested to merge wleight/athena:ATLASRECTS-6670_score into master

Tracks that are too poor quality to be scored are assigned a score of 0. However, in rare cases, good tracks can also be given a score of 0, if the score assigned to the hits balances out the chi2. This leads to the crash in ATLASRECTS-6670, in which the two tracks that are input to the MuonAmbiProcessor are almost identical, so both are given a score of 0 and hence both are rejected. To prevent this, a score of 0 from the tool is changed to a score of 0.000001.

Closes ATLASRECTS-6670

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