DUBAI, June 19 (Reuters) - Banque Saudi Fransi 1050.SE , the kingdom&aposs fourth-largest listed lender, has completed a capital-boosting sukuk issue worth 2 billion riyals ($533 million), it said in a statement on Thursday.The Islamic bond, which has a ten-year lifespan but with an option for the bank to repay investors after the fifth year, priced at 140 basis points over the three-month Saudi i