Replace 'Expand DRAM' option with dropdown menu (#32)

Allows to use mods that require a larger memory pool to allocate from.

src/Ryujinx/UI/ViewModels/MainWindowViewModel.cs

@@ -913,7 +913,7 @@ namespace Ryujinx.Ava.UI.ViewModels
 
         public KeyGesture PauseKey
         {
-            get => KeyGesture.Parse(_pauseKey); 
+            get => KeyGesture.Parse(_pauseKey);
             set
             {
                 _pauseKey = value.ToString();