core/hid: Improve accuracy of the keyboard implementation

src/core/hle/service/hid/controllers/keyboard.cpp

@@ -42,6 +42,7 @@ void Controller_Keyboard::OnUpdate(const Core::Timing::CoreTiming& core_timing,
 
         next_state.key = keyboard_state;
         next_state.modifier = keyboard_modifier_state;
+        // This is always enabled on HW. Check what it actually does
         next_state.modifier.unknown.Assign(1);
     }