Fix spell power bonus being applied twice in some cases when SPELL_AU…

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Автор: killerwife

Fix spell power bonus being applied twice in some cases when SPELL_AURA_MOD_SPELL_DAMAGE_OF_STAT_PERCENT is usedCloses https://github.com/cmangos/issues/issues/1554

Подробнее... (https://github.com/cmangos/mangos-wotlk/commit/183003cd44c831ae6c2864398802a4106c699373)