www/py-yt-dlp-devel: Move to www/py-yt-dlp

www/py-yt-dlp is intended for those who wants to extend
yt-dlp (write Python scripts that import yt-dlp).
Another port, www/yt-dlp, is intended for end users.

Removing the -devel suffix since FreeBSD doesn't use -devel
unlike other distros.

Reported by: sunpoet@, danfe@