fix 就餐时段保存处理

Src/Dlhis.Basic/BusinessShift/Services/Implements/BusinessPlaceShiftService.cs

@@ -88,9 +88,14 @@ public class BusinessPlaceShiftService : IBusinessPlaceShiftService
 
     public async Task SaveMealShiftsAsync(List<BusinessPlaceShiftSaveMealShiftRequest> requests)
     {
+        var shiftCode = requests[0].ShiftCode;
+
+        await _dbContext.Deleteable<BusinessShiftMealRelationshipEntity>().Where(x => x.ShiftCode == shiftCode).ExecuteCommandAsync();
+
+        var shift = await CheckExistsShiftAsync(shiftCode);
+
         foreach (var request in requests)
         {
-            var shift = await CheckExistsShiftAsync(request.ShiftCode);
             await CheckExistsMealShiftAsync(request);
             await DuplicateTimePeriodAsync(request);