rtpsession: Call on-new-ssrc earlier
Right now, we may call on-new-ssrc after we have processed the first RTP packet. This prevents properly configuring the source as some property like "probation" are copied internally for use as a decreasing counter. For this specific property, it prevents the application from disabling probation on auxiliary sparse stream. Probation is harmful on sparse streams since the probation algorithm assume frequent and contiguous RTP packets.
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