Fix adding new orders clearing a previous new order's name

Also added a new observable property for the current order's name, for extra safety

GUI/MainWindow.xaml

@@ -263,7 +263,7 @@
 							LostFocus="OrdersComboBox_LostFocus"
 							SelectedIndex="{Binding SelectedModOrderIndex}"
 							Tag="{Binding}"
-							Text="{Binding SelectedModOrder.Name, Mode=TwoWay}">
+							Text="{Binding SelectedModOrderName, Mode=OneWay}">
 							<ComboBox.ItemContainerStyle>
 								<Style TargetType="ComboBoxItem">
 									<EventSetter Event="ComboBoxItem.PreviewMouseDown" Handler="OrderComboBox_OnUserClick" />

GUI/ViewModels/MainWindowViewModel.cs

@@ -207,6 +207,9 @@ public int SelectedAdventureModIndex
 		private readonly ObservableAsPropertyHelper<DivinityLoadOrder> _selectedModOrder;
 		public DivinityLoadOrder SelectedModOrder => _selectedModOrder.Value;
 
+		private readonly ObservableAsPropertyHelper<string> _selectedModOrderName;
+		public string SelectedModOrderName => _selectedModOrderName.Value;
+
 		private readonly ObservableAsPropertyHelper<bool> _isBaseLoadOrder;
 		public bool IsBaseLoadOrder => _isBaseLoadOrder.Value;
 
@@ -4637,6 +4640,7 @@ void toggleUpdatesView()
 
 			_selectedModOrder = this.WhenAnyValue(x => x.SelectedModOrderIndex, x => x.ModOrderList.Count).
 				Select(x => ModOrderList.ElementAtOrDefault(x.Item1)).ToProperty(this, nameof(SelectedModOrder));
+			_selectedModOrderName = this.WhenAnyValue(x => x.SelectedModOrder).WhereNotNull().Select(x => x.Name).ToProperty(this, nameof(SelectedModOrderName), true, RxApp.MainThreadScheduler);
 			_isBaseLoadOrder = this.WhenAnyValue(x => x.SelectedModOrder).Select(x => x != null && x.IsModSettings).ToProperty(this, nameof(IsBaseLoadOrder), true, RxApp.MainThreadScheduler);
 
 			//Throttle in case the index changes quickly in a short timespan