chore: resolve issue (#3621)

Author: SharmaDhruv2511

frontend/appflowy_flutter/lib/plugins/database_view/grid/presentation/widgets/header/type_option/number.dart

@@ -73,6 +73,7 @@ class NumberTypeOptionWidget extends TypeOptionWidget {
             height: GridSize.popoverItemHeight,
             alignment: Alignment.centerLeft,
             child: FlowyText.medium(
+              color: Theme.of(context).colorScheme.outline,
               LocaleKeys.grid_field_numberFormat.tr(),
             ),
           );