Core/Items: Split SetSoulboundTradeable in two functions (Set and Clear)

Note: this is mostly for clarify action being done: ClearSoulboundTradeable better than SetSoulboundTradeable(..., ..., false)

src/server/game/Spells/SpellEffects.cpp

@@ -3575,7 +3575,7 @@ void Spell::EffectEnchantItemPerm(SpellEffIndex effIndex)
         // add new enchanting if equipped
         item_owner->ApplyEnchantment(itemTarget, PERM_ENCHANTMENT_SLOT, true);
 
-        itemTarget->SetSoulboundTradeable(NULL, item_owner, false);
+        itemTarget->ClearSoulboundTradeable(item_owner);
     }
 }
 
@@ -3639,7 +3639,7 @@ void Spell::EffectEnchantItemPrismatic(SpellEffIndex effIndex)
     // add new enchanting if equipped
     item_owner->ApplyEnchantment(itemTarget, PRISMATIC_ENCHANTMENT_SLOT, true);
 
-    itemTarget->SetSoulboundTradeable(NULL, item_owner, false);
+    itemTarget->ClearSoulboundTradeable(item_owner);
 }
 
 void Spell::EffectEnchantItemTmp(SpellEffIndex effIndex)