Tracks: Highlight more counting errors if track looks good

Normally, Tracks puts error marks on row and column clues only when one
of the existing track or no-track marks will have to be removed to
satisfy the clue.  This could lead to a situation where the player had
built a track from A to B and got neither a win nor a highlighted error
because the only error was in a row or column having too few track
segments.

This commit re-arranges the completion checking so that if there's a
complete track from A to B and no spurious track then the game will
highlight any clue that isn't matched by the actually laid track.  This
should mean that any solution with a track from A to B will either be a
win or have a highlighted error.

This should fix Android issue #266.

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