remove duplicate id field in wotlks Cfg_Configs def

[ihm-tswow]

Fix duplicate column error when opening Cfg_Configs.dbc with wotlk settings. There is no secondary id column in Cfg_Configs.dbc for 12340.

[pangolp]

I tried it, and it's true. I hope that at some point, this code will become part of the project and that it will be reactivated.