Bring back ability to control a current Cast on Chromecast

The newest Web Player (3.11.0) breaks the ability to control a cast that is already active on the Chromecast.

So, if you’re already casting a Plex item to the Chromecast, you used to be able to go to the Plex Web Player, click the “cast” button, select the Chromecast and then a now playing bar would appear at the bottom which reflected what was currently playing. You could then play, pause, etc.

On Web Player 3.11.0, if you click the “cast” button, nothing shows up at the bottom of the screen. You cannot control a cast that is already active on the Chromecast.

I don’t know whether this is intentional (I really hope not) or not but please add it back.

2021 clean-up: implemented