Piece count is sometimes incorrect in classic and das-trainer layouts

[timotheeg]

Piece count is often off by 1 piece up or down when games are captured in the classic and das_trainer layout.

Discounting bad calibration, here are some know issues:

• First piece is duplicated causing a +1 count
• Last piece may not always be counted, since the board block count will not increase by 4 when the last piece crashes into the existing blocks

TODO: Find the issues and fix them

Expected results: On perfect calibration, piece count should be correct

Note: Having last piece missing is probably acceptable. It doesn't really add anything to the game stats, since the player is dying anyway.