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MSVertexTracketTool: Fix incorrect sign in tracklet chi squared calculation

Michael Revering requested to merge mireveri/athena:main-fix-msvtx-tracklet-reco into main

The MSVertex Tracklet fitting had an incorrect sign in the chi squared calculation, causing all tracklet segments to fail reconstruction and no MS Vertices to be produced. This patch changes the sign to the correct value, returning the MSVertex performance to its run 2 behavior.

Fixes ATLASRECTS-7166

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