Revert part of e2eb58c4230f94ef0c72fb4005e5434088d52e80

That commit included one change which shall have been
go as separate commit with more detailed description.
Fix for TransformTracks in uncalibrated pipeline

Transformation matrix was completely ignored by
TransformTracks() and final marker coordinate
exactly matched it's source coordinates.

Seems to be just a typo in vector usage: need to
use "b" (which is transformed one) instead of "a"
when converting projective coordinate to 2D space.