Core/Commands: Allow .cooldown command to work on player pets

sql/updates/world/3.3.5/2016_07_16_06_world.sql

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+UPDATE `command` SET `help`='Syntax: .cooldown [#spell_id]\r\n\r\nRemove all (if spell_id not provided) or #spel_id spell cooldown from selected character or their pet or you (if no selection).' WHERE `name`='cooldown';