Core/Spells: Fixed Shadowmourne proc

Scripts/Quests: Fixed quest 24547 (A Feast of Souls)

Closes issue #2331.

--HG--
branch : trunk

src/server/game/Spells/SpellMgr.cpp

@@ -3606,6 +3606,7 @@ void SpellMgr::LoadSpellCustomAttr()
         case 45150:                             // Meteor Slash
         case 64422: case 64688:                 // Sonic Screech
         case 72373:                             // Shared Suffering
+        case 71904:                             // Chaos Bane
             // ONLY SPELLS WITH SPELLFAMILY_GENERIC and EFFECT_SCHOOL_DAMAGE
             mSpellCustomAttr[i] |= SPELL_ATTR_CU_SHARE_DAMAGE;
             count++;