Default initialize RtpPayloadParams::chain_last_frame_id_

This ensures the chain calculation will start out with all chains reset.

Bug: b/194980850
Change-Id: I8a9edf8ecaee961cdbaa51968917a2d829045575
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227281
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Emil Lundmark <lndmrk@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34598}
diff --git a/call/rtp_payload_params.cc b/call/rtp_payload_params.cc
index ad8c1da..af3874b 100644
--- a/call/rtp_payload_params.cc
+++ b/call/rtp_payload_params.cc
@@ -138,6 +138,7 @@
   for (auto& spatial_layer : last_shared_frame_id_)
     spatial_layer.fill(-1);
 
+  chain_last_frame_id_.fill(-1);
   buffer_id_to_frame_id_.fill(-1);
 
   Random random(rtc::TimeMicros());