Turn off error resilience for VP9 if no spatial or temporal layers are configured and NACK is enabled.

Error resilience is currently always enabled for VP9 which reduces quality.

BUG=webrtc:6783

Review-Url: https://codereview.webrtc.org/2532053002
Cr-Commit-Position: refs/heads/master@{#15390}
diff --git a/webrtc/modules/video_coding/codec_database.cc b/webrtc/modules/video_coding/codec_database.cc
index 75e7043..40e31c6 100644
--- a/webrtc/modules/video_coding/codec_database.cc
+++ b/webrtc/modules/video_coding/codec_database.cc
@@ -46,7 +46,7 @@
   VideoCodecVP9 vp9_settings;
   memset(&vp9_settings, 0, sizeof(vp9_settings));
 
-  vp9_settings.resilience = 1;
+  vp9_settings.resilienceOn = true;
   vp9_settings.numberOfTemporalLayers = 1;
   vp9_settings.denoisingOn = false;
   vp9_settings.frameDroppingOn = true;