Disable keyboard controller input while swkbd is open (foreground) (second attempt) (#6808)

* Block input updates while swkbd is open in foreground mode

* Flush internal driver state before unblocking input updates

* Rename Flush to Clear and remove unnecessary attribute

* Clear the driver state only if the GamepadDriver isn't null

src/Ryujinx.Input/HLE/NpadManager.cs

@@ -174,6 +174,11 @@ namespace Ryujinx.Input.HLE
         {
             lock (_lock)
             {
+                foreach (InputConfig inputConfig in _inputConfig)
+                {
+                    _controllers[(int)inputConfig.PlayerIndex].GamepadDriver?.Clear();
+                }
+
                 _blockInputUpdates = false;
             }
         }