Turn off camera lights after disabling awareness

[mattborghi]

When awareness is disabled, camera lights shouild be off. In order to resolve this we can:

• Create an isolated test to see if the suggested implementation works on our setup https://codesandbox.io/s/camera-hooks-ryc6r?file=/src/hooks/useCamera.js
• Test the backend view implementation https://github.com/ekumenlabs/immedia/blob/81914752e53653172dcbe89519c734125f094b13/public/js/immedia-snapshots.js#L252-L267

Our implementation is already coded but it's not working as expected

telegram-tt/src/components/middle/immedia/Immedia.tsx

Lines 154 to 160 in be1275e

	if (videoMeRef.current) {
	if (videoMeRef.current.srcObject) {
	const tracks = (videoMeRef.current.srcObject as MediaStream).getTracks();
	tracks.forEach((track) => track.stop());
	}
	}
	};