Revert "Ava UI: Input Menu Refactor (#4998)"

This reverts commit 49b37550ca.

This currently breaks the GTK GUI.

src/Ryujinx.Ava/UI/ViewModels/RumbleInputViewModel.cs

@@ -0,0 +1,27 @@
+namespace Ryujinx.Ava.UI.ViewModels
+{
+    public class RumbleInputViewModel : BaseModel
+    {
+        private float _strongRumble;
+        public float StrongRumble
+        {
+            get => _strongRumble;
+            set
+            {
+                _strongRumble = value;
+                OnPropertyChanged();
+            }
+        }
+
+        private float _weakRumble;
+        public float WeakRumble
+        {
+            get => _weakRumble;
+            set
+            {
+                _weakRumble = value;
+                OnPropertyChanged();
+            }
+        }
+    }
+}