Increase the allowed number of probe packets in test to please msan.

This started flaking due to allowing probes to restart if they were aborted due to insufficient packets. This is reasonable behavior.

TBR=pbos@webrtc.org

Review URL: https://codereview.webrtc.org/1701033002 .

Cr-Commit-Position: refs/heads/master@{#11638}
diff --git a/webrtc/video/end_to_end_tests.cc b/webrtc/video/end_to_end_tests.cc
index 0deb4a5..af2c38b 100644
--- a/webrtc/video/end_to_end_tests.cc
+++ b/webrtc/video/end_to_end_tests.cc
@@ -703,7 +703,7 @@
 // retransmitted and renders. Retransmission SSRCs are also checked.
 void EndToEndTest::DecodesRetransmittedFrame(bool enable_rtx, bool enable_red) {
   // Must be set high enough to allow the bitrate probing to finish.
-  static const int kMinProbePackets = 30;
+  static const int kMinProbePackets = 100;
   static const int kDroppedFrameNumber = kMinProbePackets + 1;
   class RetransmissionObserver : public test::EndToEndTest,
                                  public I420FrameCallback {