[#3] MainWindow: Add functionality to import data from files

Elwig/Helpers/Export/ElwigData.cs

@@ -208,7 +208,7 @@ namespace Elwig.Helpers.Export {
                     }
                     if (members.Count > 0) {
                         var n = importNewMembers ? members.Count - duplicateMgNrs.Count : 0;
-                        var o = importDuplicateDeliveries ? duplicateMgNrs.Count : 0;
+                        var o = importDuplicateMembers ? duplicateMgNrs.Count : 0;
                         importedMembers.Add((meta.FileName, meta.ZwstId, meta.Device, n, o, members.Count - n - o, meta.MemberFilters));
                     }