TrkVKalVrtFitter: Fix Trk::Track creation for perigee track

Closed Louis-Guillaume Gagnon requested to merge lgagnon/athena:VKalVrtFitter-fix-perigee into 22.0

This MR ports a change from master to 22.0 that fixes perigee track creation in VKalVrtFitter. The corresponding commit on master cannot be cherry-picked since it contains changes unrelated to the bugfix.

Commit on master branch: 5b26e1d9

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