Per default enable WebRTC-PaddingMode-RecentLargePacket

This means that RtpPacketHistory::PaddingMode::kRecentLargePacket is
used per default.

Bug: webrtc:15201, b/284281602
Change-Id: If8feb66105a9b1e13ae4cb28a44a74c8839b72e1
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/327602
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Auto-Submit: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#41215}
diff --git a/modules/rtp_rtcp/source/rtp_rtcp_impl2.cc b/modules/rtp_rtcp/source/rtp_rtcp_impl2.cc
index 800ec77..3dbbc77 100644
--- a/modules/rtp_rtcp/source/rtp_rtcp_impl2.cc
+++ b/modules/rtp_rtcp/source/rtp_rtcp_impl2.cc
@@ -53,8 +53,8 @@
 
 RtpPacketHistory::PaddingMode GetPaddingMode(
     const FieldTrialsView* field_trials) {
-  if (field_trials &&
-      field_trials->IsEnabled("WebRTC-PaddingMode-RecentLargePacket")) {
+  if (!field_trials ||
+      !field_trials->IsDisabled("WebRTC-PaddingMode-RecentLargePacket")) {
     return RtpPacketHistory::PaddingMode::kRecentLargePacket;
   }
   return RtpPacketHistory::PaddingMode::kPriority;