fix unique为null问题

Src/Dlhis.Basic/Device/Request/DeviceSaveRequest.cs

@@ -78,11 +78,6 @@ public class DeviceSaveRequest : IValidatableObject
 
     public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
     {
-        if (Id.HasValue)
-        {
-            UniqueNo = null;
-        }
-
         if (Type != DeviceTypeEnumType.Door && AsAttendance)
         {
             yield return new ValidationResult($"{DeviceTypeEnumType.Door.GetDescription()}才可设置作为考勤设备", new[] { nameof(AsAttendance) });

Src/Dlhis.Basic/Device/Services/Implements/DeviceService.cs

@@ -204,7 +204,8 @@ public class DeviceService : IDeviceService
     /// <returns></returns>
     private async Task CheckUniqueNoExistsAsync(DeviceSaveRequest request)
     {
-        var exists = await _dbContext.Queryable<DeviceEntity>().Where(x => x.UniqueNo == request.UniqueNo)
+        var exists = await _dbContext.Queryable<DeviceEntity>()
+              .Where(x => x.UniqueNo == request.UniqueNo)
               .WhereIF(request.Id.HasValue, x => x.Id != request.Id)
               .AnyAsync();