[PBE-5816] Fix camera selection method

[liviu-timar]

🎯 Goal

Fix reported bug:

Selecting a device id seems to break if the device id isn't the front facing camera. The VideoRenderer does not show any video until I change the camera and disable and reenable it.

🛠 Implementation details

Refactor the select, flip and setup methods in MediaManager.

🧪 Testing

• Add call.camera.select("0") (use the main back camera ID) to the call lobby screen.
• Start the call.
• Switch between back/front cameras.

🎉 GIF