Allow to set av1 scalability mode after encoder is constructed

Bug: webrtc:11404
Change-Id: I70b4115c8afdc4f32fd876d31d54b7d95d0a7e1b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/188582
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32437}
diff --git a/test/video_codec_settings.h b/test/video_codec_settings.h
index 8e56535..82c82cd 100644
--- a/test/video_codec_settings.h
+++ b/test/video_codec_settings.h
@@ -25,7 +25,7 @@
 const uint16_t kTestOutlierFrameSizePercent = 250;
 
 static void CodecSettings(VideoCodecType codec_type, VideoCodec* settings) {
-  memset(settings, 0, sizeof(VideoCodec));
+  *settings = {};
 
   settings->width = kTestWidth;
   settings->height = kTestHeight;