Merge pull request #13558 from MrSmite/3.3.5

Fix spell cooldown for guardian pets
Fixes https://github.com/TrinityCore/TrinityCore/issues/13450 , closes https://github.com/TrinityCore/TrinityCore/pull/13452 and https://github.com/TrinityCore/TrinityCore/pull/13558

src/server/game/Spells/Spell.cpp

@@ -3438,7 +3438,7 @@ void Spell::SendSpellCooldown()
     {
         // Handle pet cooldowns here if needed instead of in PetAI to avoid hidden cooldown restarts
         Creature* _creature = m_caster->ToCreature();
-        if (_creature && _creature->IsPet())
+        if (_creature && (_creature->IsPet() || _creature->IsGuardian()))
             _creature->AddCreatureSpellCooldown(m_spellInfo->Id);
 
         return;