Make RtpEncodingParameters to not reverse active flags order

Bug: webrtc:11319
Change-Id: If63db02d282ee622c12405f85c0fbae1ba13fcb2
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168196
Reviewed-by: Florent Castelli <orphis@webrtc.org>
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30459}
diff --git a/modules/video_coding/video_codec_initializer_unittest.cc b/modules/video_coding/video_codec_initializer_unittest.cc
index ca1da2c..d5a18f0 100644
--- a/modules/video_coding/video_codec_initializer_unittest.cc
+++ b/modules/video_coding/video_codec_initializer_unittest.cc
@@ -351,14 +351,14 @@
   EXPECT_TRUE(codec_out_.spatialLayers[2].active);
 
   // Deactivate top layer.
-  config_.simulcast_layers[0].active = false;
+  config_.simulcast_layers[2].active = false;
   EXPECT_TRUE(InitializeCodec());
   EXPECT_TRUE(codec_out_.spatialLayers[0].active);
   EXPECT_TRUE(codec_out_.spatialLayers[1].active);
   EXPECT_FALSE(codec_out_.spatialLayers[2].active);
 
   // Deactivate middle layer.
-  config_.simulcast_layers[0].active = true;
+  config_.simulcast_layers[2].active = true;
   config_.simulcast_layers[1].active = false;
   EXPECT_TRUE(InitializeCodec());
   EXPECT_TRUE(codec_out_.spatialLayers[0].active);