Fix stream playing stops when exit from fullscreen mode on iOS

[Spirituss]

When you open full screen mode then exit from it, you see just still picture but not streaming video. In order to start stream again you "play" button should be pressed.

[AlexxIT]

Do you use ui: true?

[weitheng]

Having the same problem as well with ui: false.

When I include ui: true, I can't see the fullscreen icon which is supposed to be on the lower left corner of the stream.

Running on iOS HA App, OS: iOS 14.6

[AlexxIT]

iOS doesn't support fullscreen with custom UI

[weitheng]

I see, then the only problem is the stream will pause when exiting from full-screen with ui: false

[AlexxIT]

https://github.com/AlexxIT/WebRTC/releases/tag/v3.5.0