fix(Scripts/Hyjal): Cannibalize should heal more than 1 (#18766)

* init

* include SpellScript.h

data/sql/updates/pending_db_world/rev_1713549415418061715.sql

@@ -0,0 +1,3 @@
+--
+DELETE FROM `spell_script_names` WHERE `spell_id` = 31538;
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES (31538, 'spell_cannibalize_heal');

src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/hyjal.cpp

@@ -19,6 +19,8 @@
 #include "Player.h"
 #include "ScriptedCreature.h"
 #include "ScriptedGossip.h"
+#include "SpellScript.h"
+#include "SpellScriptLoader.h"
 #include "hyjal.h"
 
 enum Spells
@@ -327,6 +329,26 @@ public:
 
 };
 
+// 31538 - Cannibalize (Heal)
+class spell_cannibalize_heal : public SpellScript
+{
+    PrepareSpellScript(spell_cannibalize_heal);
+
+    void HandleHeal(SpellEffIndex /*effIndex*/)
+    {
+        if (Unit* caster = GetCaster())
+        {
+            uint32 heal = caster->CountPctFromMaxHealth(7);
+            SetHitHeal(heal);
+        }
+    }
+
+    void Register() override
+    {
+        OnEffectHitTarget += SpellEffectFn(spell_cannibalize_heal::HandleHeal, EFFECT_0, SPELL_EFFECT_HEAL);
+    }
+};
+
 struct npc_hyjal_ground_trash : public ScriptedAI
 {
     npc_hyjal_ground_trash(Creature* creature) : ScriptedAI(creature)
@@ -704,4 +726,5 @@ void AddSC_hyjal()
     RegisterHyjalAI(npc_hyjal_ground_trash);
     RegisterHyjalAI(npc_hyjal_gargoyle);
     RegisterHyjalAI(npc_hyjal_frost_wyrm);
+    RegisterSpellScript(spell_cannibalize_heal);
 }