Do not provide the watch id for a video that is not public

[NDevTK]

Description

I think videos that are not public should not be exposed to the server. (or public as db is public)
This should affect both private and unlisted videos.

Suggested options

• Prompt user
• Do not send request to server
• Use a substring of a hard to compute hash when no times are submitted

Detection

let Public = (document.getElementsByClassName("style-scope ytd-badge-supported-renderer")[2].innerText === "");

[ajayyy]

I use unlisted videos for debugging purposes, so this will have to be optional. This is a good idea.

[NDevTK]

A prompt would probably be the easiest to add. (and still allow for debugging)
However "a substring of a hard to compute hash when no times are submitted" would
probably be a nice feature to have.

[NDevTK]

PR: #224