fix(reorder-group): revert item to original position when passing fal…

…se to complete (#21396)

fixes #19128

core/src/components/reorder-group/reorder-group.tsx

@@ -219,7 +219,7 @@ export class ReorderGroup implements ComponentInterface {
       const toIndex = this.lastToIndex;
       const fromIndex = indexForItem(selectedItemEl);
 
-      if (toIndex !== fromIndex && (!listOrReorder || listOrReorder === true)) {
+      if (toIndex !== fromIndex && (listOrReorder === undefined || listOrReorder === true)) {
         const ref = (fromIndex < toIndex)
           ? children[toIndex + 1]
           : children[toIndex];