webrtc_apm: Apply gain_controller2_adaptive_digital_mode

GainController2.adaptive_digital_mode was missing when converting
settings from caller. Add it now.

BUG=b:117162017
TEST=Manual test on nocturne

Change-Id: I46cbf19802ddaee6539a25e04d40df49ea65e86b
Reviewed-on: https://chromium-review.googlesource.com/1267579
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Hsinyu Chao <hychao@chromium.org>
Reviewed-by: Hsinyu Chao <hychao@chromium.org>
diff --git a/webrtc_apm.cc b/webrtc_apm.cc
index beba356..0b9e0cf 100644
--- a/webrtc_apm.cc
+++ b/webrtc_apm.cc
@@ -230,6 +230,8 @@
 		apm_config->gain_controller2_enabled;
 	ap_config->gain_controller2.fixed_gain_db =
 		apm_config->gain_controller2_fixed_gain_db;
+	ap_config->gain_controller2.adaptive_digital_mode =
+		apm_config->gain_controller2_adaptive_digital_mode;
 	return 0;
 }