[12611] Hide known recipes when the Usable box is checked in the AH.

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<pre style='white-space:pre-wrap;width:81ex'>[12611] Hide known recipes when the Usable box is checked in the AH.

Fixes cmangos/issues#394.</pre>


Подробнее... (https://github.com/cmangos/mangos-wotlk/commit/2669e09131998beb6b578bdeec8625f204153006)