RTP: remove dead-code (#1953)

The checks `isValidMSRTPType(..) == 1` is a subset of
`is_valid_rtp_payload_type()` so this if-branch is never reached.

More importantly, the article describing how to detect Microsoft Lync and
Skype for Business is from 2014. These payload types are static or they
are in the dynamic range: in both cases, these values might be used (and
they are used indeed) pretty much by every application.
Bottom line: we can't use PT alone to identify a specific protocol.

Keep the list, since it is used to tell audio streams from video ones.

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