Fix: Input page is saved only when input is changed

This is an attempt to decouple "saving gamepad settings" from the rest of the emulator settings. Should fix the issue where the gamepad was not detected when starting the emulator and the game (usually after saving settings with the gamepad turned off)

src/Ryujinx/UI/Views/Input/KeyboardInputView.axaml.cs

@@ -60,6 +60,8 @@ namespace Ryujinx.Ava.UI.Views.Input
 
                     PointerPressed += MouseClick;
 
+                    FlagInputConfigChanged();
+
                     if (DataContext is not KeyboardInputViewModel viewModel)
                         return;
 
@@ -184,6 +186,11 @@ namespace Ryujinx.Ava.UI.Views.Input
             }
         }
 
+        private void FlagInputConfigChanged()
+        {
+            (DataContext as KeyboardInputViewModel)!.ParentModel.IsInputConfigChanged = true;
+        }
+
         private void MouseClick(object sender, PointerPressedEventArgs e)
         {
             bool shouldUnbind = e.GetCurrentPoint(this).Properties.IsMiddleButtonPressed;