Fixed incorrect save order when adding balance to shop

src/main/java/com/alttd/playershops/shop/PlayerShop.java

@@ -193,9 +193,9 @@ public class PlayerShop {
             return false; // cancelled by another plugin, does this need logging?
 
         setDirty(true);
-        update();
         this.balance += amount;
         this.setLastTransaction(System.currentTimeMillis());
+        update();
         return true;
     }