Minor improvements to belt performance

src/js/game/components/belt.js

@@ -64,7 +64,7 @@ export class BeltComponent extends Component {
     /**
      *  Returns if the belt can currently accept an item from the given direction
      */
-    canAcceptItem(leftoverProgress = 0.0) {
+    canAcceptItem() {
         const firstItem = this.sortedItems[0];
         if (!firstItem) {
             return true;