Reduce RtpFrameReferenceFinder fuzzer input to more reasonable value
Reduce RtpFrameReferenceFinder fuzzer input to more reasonable value

frame_id is unwraped from a 16bit value.
Getting to int64_t boundaries would take more than 2^48 packets.
That scenario considered unrealistic and thus untested.

Bug: chromium:1053482
Change-Id: Ib3f52d4528b20915b2330773f616d9304f45cac6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168682
Reviewed-by: Sam Zackrisson <b1a93beadfe1d2f7f0106ee02b6ffcdc950aa103@webrtc.org>
Commit-Queue: Danil Chapovalov <55de8d9c2b5977da2dd48f967f21f9d606b172a5@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#30607}

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