Autoselect interaction creator

FoodsharingSiegen.Server/Pages/ProspectsTodo.razor.cs

@@ -110,6 +110,7 @@ namespace FoodsharingSiegen.Server.Pages
         /// <param name="arg">The arg</param>
         private async Task OnAddInteraction(Interaction arg)
         {
+            arg.UserID = CurrentUser.Id;
             await ProspectService.AddInteraction(arg);
             await LoadProspects();
         }