itemstats: remove quest field

this has always been unused and isn't particularly useful to us anyway

http-api/src/main/java/net/runelite/http/api/item/ItemStats.java

@@ -30,7 +30,6 @@ import lombok.Value;
 @Value
 public class ItemStats
 {
-	private boolean quest;
 	private boolean equipable;
 	private double weight;
 	@SerializedName("ge_limit")
@@ -79,7 +78,7 @@ public class ItemStats
 			newEquipment = equipment;
 		}
 
-		return new ItemStats(quest, equipable, newWeight, 0, newEquipment);
+		return new ItemStats(equipable, newWeight, 0, newEquipment);
 	}
 }