misc: Collapse LdnGameDataArray into the main class as an inner class

- privated the constructor; only obtainable by the static helper on the main LdnGameData class.
- constructor logic now in the static helper; constructor just directly sets the data it's given.

src/Ryujinx/UI/Windows/MainWindow.axaml.cs

@@ -171,9 +171,12 @@ namespace Ryujinx.Ava.UI.Windows
                 ViewModel.LdnData.Clear();
                 foreach (var application in ViewModel.Applications)
                 {
-                    ViewModel.LdnData[application.IdString] = new LdnGameDataArray(
-                        ldnGameDataArray,
-                        ref application.ControlHolder.Value
+                    ref var controlHolder = ref application.ControlHolder.Value;
+                    
+                    ViewModel.LdnData[application.IdString] = 
+                        LdnGameData.GetArrayForApp(
+                            ldnGameDataArray, 
+                            ref controlHolder
                         );
                     
                     UpdateApplicationWithLdnData(application);