ge: fix computing bought/sold amount

Use the total spent price instead of the delta spent price, as it is
being divided by the total quantity

http-api/src/main/java/net/runelite/http/api/ge/GrandExchangeTrade.java

@@ -38,6 +38,7 @@ public class GrandExchangeTrade
 	private int dqty;
 	private int total;
 	private int spent;
+	private int dspent;
 	private int offer;
 	private int slot;
 	private WorldType worldType;