Fixed pagination issues on item mapper

src/app/collection-page/collection-item-mapper/collection-item-mapper.component.ts

@@ -144,7 +144,9 @@ export class CollectionItemMapperComponent implements OnInit {
           this.shouldUpdate$.next(false);
         }
         return this.itemDataService.findListByHref(collectionRD.payload._links.mappedItems.href, Object.assign(options, {
-          sort: this.defaultSortOptions
+          currentPage: options.pagination.currentPage,
+          elementsPerPage: options.pagination.pageSize,
+          sort: this.defaultSortOptions,
         }),!shouldUpdate, false, followLink('owningCollection')).pipe(
           getAllSucceededRemoteData()
         );