Core/Spells: Check passive attribute on the final spell that will be cast by CMSG_CAST_SPELL, after taking overriden spells into account

Port From (https://github.com/TrinityCore/TrinityCore/commit/a1e2ad439db6e69ab146655951f730c766b351f9)

Source/Game/Handlers/SpellHandler.cs

@@ -291,9 +291,6 @@ namespace Game
                 return;
             }
 
-            if (spellInfo.IsPassive())
-                return;
-
             Unit caster = mover;
             if (caster.IsTypeId(TypeId.Unit) && !caster.ToCreature().HasSpell(spellInfo.Id))
             {
@@ -336,6 +333,9 @@ namespace Game
             // Check possible spell cast overrides
             spellInfo = caster.GetCastSpellInfo(spellInfo);
 
+            if (spellInfo.IsPassive())
+                return;
+
             // can't use our own spells when we're in possession of another unit,
             if (GetPlayer().IsPossessing())
                 return;