Correct calculated doca in KF tracking#1108
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In KF tracking, calculated doca is defined as projection point of fit trajectory and wire line, but doca is supposed to the closest approach between trajectory and wire line. Therefore, calculated doca is corrected by alpha at TB level.
As test, the update fixes issue for bias of fit residual.
No effect on HB tracking.
Change on TB track is slight since effects on L&R hits offset and hit error is scaled by 2 during tracking.