Gray items being added to auction house regardless of aicconfig setting

[joshuatdr]

The mod_auctionator_itemclass_config table column "bonding" incorrectly specifies the minimum item quality of each class/subclass which should be posted to the AH.

This column should be renamed to "quality", as per the table description:
`bonding` int NOT NULL COMMENT 'bonding level that is the minimum for this class. 2 means greens (for gear), 1 means whites (for bags).',

'Bonding' refers to the behaviour of the item becoming soulbound to the player (bind on pickup, bind on equip, bind on use etc.) whereas quality is poor, common, uncommon (gray, white, green...) -- see https://www.azerothcore.org/wiki/item_template