EXT-7777 FIXED reverted changes to show loading indicator for "Wear/Attach" action.

Because it was too hard to fix EXT-7949 having so extremly lack of time.
Proper fix for EXT-7949 requires changes in different places of the code calling add/removeCOFItemLink().

Reviewed by Neal Orman at https://codereview.productengine.com/secondlife/r/644/

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branch : product-engine