settings: Show underline for select options

packages/settings/lib/src/widgets/dropdown_button_settings_tile.dart

@@ -33,8 +33,7 @@ class DropdownButtonSettingsTile<T> extends InputSettingsTile<SelectOption<T>> {
                     : Theme.of(context).textTheme.subtitle1!.copyWith(color: Theme.of(context).disabledColor),
               ),
               trailing: valuesSnapshot.hasData
-                  ? DropdownButtonHideUnderline(
+                  ? DropdownButton<T>(
-                      child: DropdownButton<T>(
                       value: value,
                       items: valuesSnapshot.data!.keys
                           .map(
@@ -49,7 +48,6 @@ class DropdownButtonSettingsTile<T> extends InputSettingsTile<SelectOption<T>> {
                               await option.set(value as T);
                             }
                           : null,
-                      ),
                     )
                   : null,
             ),