[preview] a posible fix for #1959 is to update closeddate first. befo…

…re state! (#2062)

a posible fix for #1959 is to update closeddate first. before state!

src/VstsSyncMigrator.Core/Execution/MigrationContext/WorkItemMigrationContext.cs

@@ -456,6 +456,7 @@ private void PopulateWorkItem(WorkItemData oldWorkItemData, WorkItemData newWork
  }
 
  newWorkItem.Title = oldWorkItem.Title;
+ newWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].Value = oldWorkItem.Fields["Microsoft.VSTS.Common.ClosedDate"].Value;
  newWorkItem.State = oldWorkItem.State;
  newWorkItem.Reason = oldWorkItem.Reason;