Handle playlists cataloged as Podcast

[Fijxu]

Videos of a playlist cataloged as podcast are called episodes therefore Invidious was not able to find video in the text value inside the stats array.

This can be tested in my Debug Instance: https://debuginv.nadeko.net/playlist?list=PLDu-Eh5lUs1a4irCbnxMIB6FrUMaTXgVF

Fixes #4688

[amiria703]

Any updates on this?

[SamantazFox]

Thanks for your contribution!