Exclude RTX from pacer delay plots

This is because padding (sent as RTX) makes the plot unreadable.

TBR=terelius@webrtc.org

Bug: None
Change-Id: Iddf681eab6ec826c6f3c620aac65e2bd6f31b895
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133182
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27641}
diff --git a/rtc_tools/event_log_visualizer/analyzer.cc b/rtc_tools/event_log_visualizer/analyzer.cc
index 38cec78a..bb662d0 100644
--- a/rtc_tools/event_log_visualizer/analyzer.cc
+++ b/rtc_tools/event_log_visualizer/analyzer.cc
@@ -1487,6 +1487,10 @@
     const std::vector<LoggedRtpPacketOutgoing>& packets =
         stream.outgoing_packets;
 
+    if (IsRtxSsrc(kOutgoingPacket, stream.ssrc)) {
+      continue;
+    }
+
     if (packets.size() < 2) {
       RTC_LOG(LS_WARNING)
           << "Can't estimate a the RTP clock frequency or the "