Ensure points are properly assigned if a user somehow gets duplicate fish

src/main/java/com/alttd/fishingevent/gui/windows/SellWindow.java

@@ -60,7 +60,7 @@ public class SellWindow extends GUI {
             if (content == null) {
                 continue;
             }
-            int points = getPoints(content, namespacedKey);
+            int points = getPoints(content, namespacedKey) * content.getAmount();
             if (points == -1) {
                 itemsToMoveBack.add(content);
             } else {