EXT-8328 FIXED passed missing parameter (callback) instead of a default one to...

EXT-8328 FIXED passed missing parameter (callback) instead of a default one to the LLAppearanceMgr::addCOFItemLink(...)

appearance update callback wasn't passed down to LLAppearanceMgr::addCOFItemLink(...),
so wearables list was updated before receiving server response regarding creating of the COF item link

Reviewed by Vadim Savchuk at https://codereview.productengine.com/secondlife/r/741/

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branch : product-engine