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webrtc: don't generate duplicate rtx payloads when bundle-policy is set

Matthew Waters requested to merge ystreet/gst-plugins-bad:fix-webrtc-bundle-rtx-codec-prefs into master

It was possible to generate a SDP that had an RTX payload type that matched one of the media payload types when providing caps via codec_preferences without any sink pads.

Fixes

m=video 9 UDP/TLS/RTP/SAVPF 96
...
a=rtpmap:96 VP8/90000
a=rtcp-fb:96 nack pli
a=fmtp:96 apt=96
Edited by Matthew Waters

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