(Reuters) - One year after being hit by a $2 billion scam, India’s Punjab National Bank (PNB) is set to return to annual profits and strong loan growth in fiscal 2020 even as investigations continue into the country’s biggest banking fraud. FILE PHOTO: A man reads a newspaper outside a branch of Punjab National Bank (PNB) in Ahmedabad, India, March 20, 2018. REUTERS/Amit Dave State-run PNB has already surprised markets with an earlier-than-expected profit for the quarter ended Dec. 31 as it...