Fix the position of immovable menus on scroll

See https://www.woltlab.com/community/thread/308886-dropdownignorepagescroll-bei-uisearchinput-l%C3%A4sst-dropdown-mit-ergebnissen-mitscr/

Author: dtdesign

ts/WoltLabSuite/Core/Ui/Dropdown/Simple.ts

@@ -69,6 +69,8 @@ function onScroll() {
         const menu = _menus.get(dropdown.id) as HTMLElement;
         if (!Core.stringToBool(menu.dataset.dropdownIgnorePageScroll || "")) {
           UiDropdownSimple.close(containerId);
+        } else {
+          UiDropdownSimple.setAlignment(dropdown, _menus.get(containerId)!);
         }
       }
     }