Fix caricamenti in Modal Activity

salesbook.Shared/Components/SingleElements/Modal/ActivityForm.razor

@@ -460,7 +460,10 @@
 
             Users = await ManageData.GetTable<StbUser>();
             if (!ActivityModel.UserName.IsNullOrEmpty())
+            {
                 SelectedUser = Users.FindLast(x => x.UserName.Equals(ActivityModel.UserName));
+                await InvokeAsync(StateHasChanged);
+            }
 
             if (!IsNew && Id != null)
                 ActivityFileList = await IntegryApiService.GetActivityFile(Id);