By Marie Mannes STOCKHOLM (Reuters) -Swedish truck maker AB Volvo reported a bigger-than-expected rise in fourth-quarter adjusted operating profit on Friday and said it had adjusted production levels and upped prices to compensate for cost inflation. The sector and investors alike have braced for a tougher 2024 for the trucking market with Volvo expecting fewer trucks to be registered this year than the year before and analysts flagging a downturn in demand in Europe. On Friday, Volvo cut its predictions for the total European heavy truck market this year, seeing 280,000 units for the region i…