MemberAdminWindow: Add pending member movement export

Elwig/Helpers/Export/Bki.cs

@@ -46,10 +46,6 @@ namespace Elwig.Helpers.Export {
             await ExportAsync(rows);
         }
 
-        public void Export(int year) {
-            ExportAsync(year).GetAwaiter().GetResult();
-        }
-
         public override string FormatRow(Row row) {
             var (member, delivery) = row;
             var (lfBisNr, familyName, name, billingName, address, plz, ort, vollablieferer, area) = member;