jitterbuffer: fix packet_spacing calculation
When encountering an unexpected gap in received seqnums, ips_pts and ips_rtptime must be reset to avoid calculating a potentially invalid packet spacing the next time sequential packets are received.
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When encountering an unexpected gap in received seqnums, ips_pts and ips_rtptime must be reset to avoid calculating a potentially invalid packet spacing the next time sequential packets are received.