webrtcbin: Fix default value when SDP direction is unspecified
According to RFC 4566 (section 6), if sendrecv/sendonly/recvonly are not specified, the default is sendrecv, except for broadcast and H332 conference types.
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According to RFC 4566 (section 6), if sendrecv/sendonly/recvonly are not specified, the default is sendrecv, except for broadcast and H332 conference types.