Fix SMALLINT only letting 65535 players to log

We just ran into the problem where new users didn't make any edits and after some digging I just found out why:
The playerid in the kb-players table was a SMALLINT. Changing that to an INT should work for some more years now ;-)
Thought I should let you know.

Greetings and a big thx from Cube-Nation, where we thus used this great tool for around 1,5 years with 655365 users *YEEHAWWW*