audio: Make the couldn't load warning log a debug log

Since we return -1 on Audio::RegisterSFX, let the caller
determine whether to log.

Author: DolceTriade

src/engine/audio/Sample.cpp

@@ -49,7 +49,7 @@ namespace Audio {
 	    auto audioData = LoadSoundCodec(GetName());
 
 	    if (audioData.size == 0) {
-		    audioLogs.Warn("Couldn't load sound %s, it's empty!", GetName());
+		    audioLogs.Debug("Couldn't load sound %s, it's empty!", GetName());
             return false;
         }
 

src/engine/audio/SoundCodec.cpp

@@ -75,7 +75,7 @@ AudioData LoadSoundCodec(std::string filename)
 	int bestLoader = -1;
 	const FS::PakInfo* bestPak = nullptr;
 	std::string strippedname = FS::Path::StripExtension(filename);
-	
+
 	for (int i = 0; i < numSoundLoaders; i++)
 	{
 		std::string altName = Str::Format("%s%s", strippedname, soundLoaders[i].ext);
@@ -102,7 +102,7 @@ AudioData LoadSoundCodec(std::string filename)
 		return AudioData();
 	}
 
-	audioLogs.Warn("Sound file %s not found.", filename);
+	audioLogs.Debug("Sound file %s not found.", filename);
 	return AudioData();
 
 }