Core/Spells: Fix spell 73655 Harvest souls. It was scaling damage with PCT Damage done

--- a/src/server/game/Spells/SpellMgr.cpp
+++ b/src/server/game/Spells/SpellMgr.cpp
@@ -3597,6 +3597,7 @@ void SpellMgr::LoadSpellInfoCorrections()
                 break;
             case 73655: // Harvest Soul
                 spellInfo->AttributesEx3 |= SPELL_ATTR3_NO_DONE_BONUS;
+               spellInfo->AttributesEx6 |= SPELL_ATTR6_NO_DONE_PCT_DAMAGE_MODS;
                 break;
             case 73540: // Summon Shadow Trap
                 spellInfo->DurationEntry = sSpellDurationStore.LookupEntry(23); // 90 seconds