Remove TODO/add context if file fails to read

Author: alan-george-lk

src/tests/unit/test_audio_processing_module.cpp

@@ -801,9 +801,8 @@ TEST_F(AudioProcessingModuleTest, AGCAttenuatesLoudSpeech) {
   int sample_rate = 0;
   int num_channels = 0;
 
-  // TODO: figure out what generates this welcome.wav file such that this test isn't skipped
   std::string wav_path = std::string(LIVEKIT_ROOT_DIR) + "/data/welcome.wav";
-  ASSERT_TRUE(readWavFile(wav_path, original_samples, sample_rate, num_channels)) << "Could not read " << wav_path;
+  ASSERT_TRUE(readWavFile(wav_path, original_samples, sample_rate, num_channels)) << "Could not read " << wav_path << " (is Git LFS pulled?)";
 
   std::cout << "[AGC-LoudSpeech] Loaded " << original_samples.size()
             << " samples, " << sample_rate << " Hz, " << num_channels