db: record the promotion date if player is promoted
db: record the promotion date if player is promoted

If a player moves to a higher ladder record the match date as
the player's promotion date for that ladder.

Signed-off-by: Ilija Hadzic <47a09d4a4430975766160361f65fc72633be50b6@gmail.com>

ihadzic/jim,ihadzic/jim,ihadzic/jim