deleteOutfit static method
删除搭配
Implementation
static Future<void> deleteOutfit(String outfitId) async {
final prefs = await SharedPreferences.getInstance();
final outfits = await getAllOutfits();
outfits.removeWhere((outfit) => outfit.id == outfitId);
final jsonList = outfits.map((o) => o.toJson()).toList();
await prefs.setString(_keyOutfitCalendar, jsonEncode(jsonList));
}