Don't remove num when canonizing num keys

[Avasam]

I have to manually check the is_keypad event when registering a key and save the proper string. And fallback to pyautogui for sending num keys. There's no workaround for hotkeys since the last keyboard even isn't sent in the callback.

Otherwise num keys and non-num keys affect each other. This includes num Home, num PgUp/PgDn, num End, num Del (aka decimal) etc.