fix: item's quick cast (AscensionGameDev#2178)

Restored quick casting functionality for spell items, resolving my mess from PR AscensionGameDev#2174. Also ensured last projectile removal for quick casted spells is working as expected.

Author: Arufonsu

Intersect.Server.Core/Entities/Player.cs

@@ -5483,7 +5483,7 @@ public void UseSpell(int spellSlot, Entity target)
         public override void CastSpell(Guid spellId, int spellSlot = -1)
         {
             var spellBase = SpellBase.Get(spellId);
-            if (spellBase == null || spellSlot < 0 || spellSlot >= Options.MaxPlayerSkills)
+            if (spellBase == null)
             {
                 return;
             }