Check for Updates doesn't check for yt-dlp update too

[as-muncher]

vividl 0.6.0.0

When I select Options -> Check for updates, it only checks for the program update, not yt-dlp update too. I have to go manually to Options -> Settings -> Application and manually select "check for updates" for the program and for yt-dlp. What should happen is that when I do a check for updates, all updates should be checked for, not just for the program.

Also, the yt-dlp version should probably show up in About too.

[alxnull]

This makes sense, I'll modify the "Check for updates" menu item to also check for yt-dlp updates.