Only update the YCbCr Matrix when resampling if it was actually changed

src/resolution_resampler.cpp

@@ -283,6 +283,7 @@ void ResampleResolution(AssFile *ass, ResampleSettings settings) {
 
 	ass->SetScriptInfo("PlayResX", std::to_string(settings.dest_x));
 	ass->SetScriptInfo("PlayResY", std::to_string(settings.dest_y));
+	if (resample_colors)
 		ass->SetScriptInfo("YCbCr Matrix", MatrixToString(settings.dest_matrix));
 
 	ass->Commit(_("resolution resampling"), AssFile::COMMIT_SCRIPTINFO | AssFile::COMMIT_DIAG_FULL);