UI: Only show DLC RomFS button under Extract Data when DLCs are available.

Also convert the constructor of DlcSelectViewModel to expect a normal title id and not one already converted to the base ID.

src/Ryujinx/UI/ViewModels/MainWindowViewModel.cs

@@ -481,6 +481,8 @@ namespace Ryujinx.Ava.UI.ViewModels
             }
         }
 
+        public bool HasDlc => ApplicationLibrary.HasDlcs(SelectedApplication.Id);
+
         public string CacheLoadStatus
         {
             get => _cacheLoadStatus;