(Reuters) -British banknote maker De La Rue on Tuesday kept its annual forecast unchanged and reported half-year profit in line with its expectations, helped by a recovery in demand for currency notes. Demand for cash had slumped to a two-decade low earlier in the year, De La Rue said in April, as central banks and governments stock-piled huge amount of cash during the pandemic and digital banking and contact-less payment become more popular. But the designer of currency notes, including the new King Charles banknotes, has seen demand recover with inflationary pressures driving banknote orders…