Fix code scanning alert - Overly permissive regular expression range

[Jason Cameron]

Tracking issue for:

• https://github.com/elebumm/RedditVideoMakerBot/security/code-scanning/6

should be updated to ~ ^(http(s)??\:\/\/)?(www\.)?((youtube\.com\/watch\?v=)|(youtu.be\/))([a-zA-Z0-9\-_])+

see https://regex101.com/r/xCCtQS/3