Revert "UI: Use flac for lossless audio"

This reverts commit 6e20310945ad181938b6e096f2af0b13bb1f97d6.

FLAC doesn't work properly in AVI files, and MKV files don't work in
vegas.  So, sadly the only solution is to use lossless audio at a super
high bitrate for the time being.

obs/window-basic-main-outputs.cpp

@@ -153,9 +153,10 @@ void SimpleOutput::LoadRecordingPreset_Lossless()
 	obs_output_release(fileOutput);
 
 	obs_data_t *settings = obs_data_create();
-	obs_data_set_string(settings, "format_name", "mkv");
+	obs_data_set_string(settings, "format_name", "avi");
 	obs_data_set_string(settings, "video_encoder", "utvideo");
-	obs_data_set_string(settings, "audio_encoder", "flac");
+	obs_data_set_int(settings, "audio_bitrate", 512);
+	obs_data_set_string(settings, "audio_encoder", "ac3");
 
 	obs_output_update(fileOutput, settings);
 	obs_data_release(settings);
@@ -450,7 +451,7 @@ bool SimpleOutput::StartRecording()
 	if (lastChar != '/' && lastChar != '\\')
 		strPath += "/";
 
-	strPath += GenerateTimeDateFilename(ffmpegOutput ? "mkv" : format,
+	strPath += GenerateTimeDateFilename(ffmpegOutput ? "avi" : format,
 			noSpace);
 
 	SetupOutputs();