fix(CORE/Spell): Book of the Dead unequip fix (#14839)

src/server/game/Entities/Player/Player.cpp

@@ -7006,7 +7006,11 @@ void Player::ApplyItemEquipSpell(Item* item, bool apply, bool form_change)
             continue;
 
         // Spells that should stay on the caster after removing the item.
-        constexpr std::array<int32, 1> spellExceptions = { /*Electromagnetic Gigaflux Reactivator*/ 11826 };
+        constexpr std::array<int32, 2> spellExceptions =
+        {
+            11826,  //Electromagnetic Gigaflux Reactivator
+            17490   //Book of the Dead - Summon Skeleton
+        };
         const auto found = std::find(std::begin(spellExceptions), std::end(spellExceptions), spellData.SpellId);
 
         // wrong triggering type