fix unused variable warning

Author: 78

main/audio_processing/dummy_audio_processor.cc

@@ -1,7 +1,7 @@
 #include "dummy_audio_processor.h"
 #include <esp_log.h>
 
-static const char* TAG = "DummyAudioProcessor";
+#define TAG "DummyAudioProcessor"
 
 void DummyAudioProcessor::Initialize(AudioCodec* codec) {
     codec_ = codec;