minor fixes

Mlaumcherb.Client.Avalonia/зримое/MainWindow.axaml.cs

@@ -281,6 +281,7 @@ public partial class MainWindow : Window
                 {
                     VersionCatalogItemsComboBox.Items.Add(new VersionItemView(p));
                 }
+                VersionCatalogItemsComboBox.SelectedIndex = 0;
                 VersionCatalogItemsComboBox.IsEnabled = true;
                 AddVersionButton.IsEnabled = versions.Count > 0;
             });