[#79] Entities: Remove EF proxies

Elwig/Windows/BaseDataWindow.xaml.Branch.cs

@@ -21,7 +21,7 @@ namespace Elwig.Windows {
         private async Task BranchesInitEditing(AppDbContext ctx) {
             _branchList = new(await ctx.Branches
                 .OrderBy(b => b.Name)
-                .Include(b => b.PostalDest!.AtPlz)
+                .Include(b => b.PostalDest)
                 .ToListAsync());
             _branches = _branchList.ToDictionary(b => b.ZwstId, b => (string?)b.ZwstId);
             _branchIds = _branchList.ToDictionary(b => b, b => b.ZwstId);
@@ -32,7 +32,7 @@ namespace Elwig.Windows {
         private async Task BranchesFinishEditing(AppDbContext ctx) {
             ControlUtils.RenewItemsSource(BranchList, await ctx.Branches
                 .OrderBy(b => b.Name)
-                .Include(b => b.PostalDest!.AtPlz)
+                .Include(b => b.PostalDest)
                 .ToListAsync());
             _branchList = null;
             _branches = null;