Only enable residual echo detector when needed in level controller perf tests.

webrtc/modules/audio_processing/level_controller/level_controller_complexity_unittest.cc

Index: webrtc/modules/audio_processing/level_controller/level_controller_complexity_unittest.cc
diff --git a/webrtc/modules/audio_processing/level_controller/level_controller_complexity_unittest.cc b/webrtc/modules/audio_processing/level_controller/level_controller_complexity_unittest.cc
index 69ef28dce4e6c3406e190d4762df8550ba7b2fd2..ed2602097511678b984c15beac26fbcba34eb029 100644
--- a/webrtc/modules/audio_processing/level_controller/level_controller_complexity_unittest.cc
+++ b/webrtc/modules/audio_processing/level_controller/level_controller_complexity_unittest.cc
@@ -205,6 +205,7 @@ void RunTogetherWithApm(std::string test_description,
     config.Set<ExtendedFilter>(new ExtendedFilter(true));
   }
   apm_config.level_controller.enabled = true;
+  apm_config.residual_echo_detector.enabled = include_default_apm_processing;
 
   std::unique_ptr<AudioProcessing> apm;
   apm.reset(AudioProcessing::Create(config));