WindowsServer: Add scancode value to KeyEvent

Author: https://github.com/asliturk
Commit: 9ec6ac31b8
Pull-request: https://github.com/SerenityOS/serenity/pull/2455
Reviewed-by: https://github.com/JonArcherII
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/bugaevc

Services/WindowServer/WindowClient.ipc

@@ -8,8 +8,8 @@ endpoint WindowClient = 4
     MouseWheel(i32 window_id, Gfx::Point mouse_position, u32 button, u32 buttons, u32 modifiers, i32 wheel_delta) =|
     WindowEntered(i32 window_id) =|
     WindowLeft(i32 window_id) =|
-    KeyDown(i32 window_id, u8 character, u32 key, u32 modifiers) =|
-    KeyUp(i32 window_id, u8 character, u32 key, u32 modifiers) =|
+    KeyDown(i32 window_id, u8 character, u32 key, u32 modifiers, u32 scancode) =|
+    KeyUp(i32 window_id, u8 character, u32 key, u32 modifiers, u32 scancode) =|
     WindowActivated(i32 window_id) =|
     WindowDeactivated(i32 window_id) =|
     WindowStateChanged(i32 window_id, bool minimized, bool occluded) =|