fix(Core/Spell): Holy Priest Tier 5 Greater Heal Refund proc (#1985)

* Holy Priest Tier 5 (2 pieces) bonus http://wotlk.cavernoftime.com/spell=37594 procs any time greater heal is cast if you have at least two pieces off this tier equiped.

src/server/scripts/Spells/spell_priest.cpp

@@ -411,6 +411,15 @@ class spell_pri_item_greater_heal_refund : public SpellScriptLoader
                 return true;
             }
             
+            bool CheckProc(ProcEventInfo& eventInfo)
+            {
+                if (HealInfo* healInfo = eventInfo.GetHealInfo())
+                    if (Unit* healTarget = healInfo->GetTarget())
+                        if (eventInfo.GetHitMask() & PROC_EX_NO_OVERHEAL && healTarget->IsFullHealth())
+                            return true;
+                return false;
+            }
+
             void HandleProc(AuraEffect const* aurEff, ProcEventInfo& /*eventInfo*/)
             {
                 PreventDefaultAction();
@@ -419,6 +428,7 @@ class spell_pri_item_greater_heal_refund : public SpellScriptLoader
 
             void Register()
             {
+                DoCheckProc += AuraCheckProcFn(spell_pri_item_greater_heal_refund_AuraScript::CheckProc);
                 OnEffectProc += AuraEffectProcFn(spell_pri_item_greater_heal_refund_AuraScript::HandleProc, EFFECT_0, SPELL_AURA_PROC_TRIGGER_SPELL);
             }
         };