Add option to hide Picture-in-picture from player buttons

[UberAfro]

I have it disabled in ffz and 7tv and I still have it show up and upon inspecting the element it shows it's a BTTV picture-in-picture element that won't leave unless ublock element picking it away

[Rikardos87]

I would also like a option to disable this button, The symbol is confusing just being a square and its just bloating the player when there is a native browser button for Picture in picture.