Adapt code to SMI changes for audio/x-wav -> audio/vnd.wave and video/x-msvideo -> video/vnd.avi
Latest shared-mime-info changed aliases for audio/vnd.wave and video/vnd.avi:
https://gitlab.freedesktop.org/xdg/shared-mime-info/-/merge_requests/224
Adapt the code, and add a test file for vnd.avi.