Disable SRTP for unifiprotect RTSPS stream

[bdraco]

Proposed change

go2rtc does not support SRTP yet https://github.com/AlexxIT/go2rtc/#source-rtsp

We are already connecting over RTSPS TCP AlexxIT/go2rtc#81 (comment) stream also prefers TCP so the connection should already be encrypted. Keeping SRTP would be bit better of course but it currently doesn't work.

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