Fix output of formatDateTimeInJodaSyntax for uneven character counts

Fix the output of function formatDateTimeInJodaSyntax when a formatter generates an uneven number of characters and the last character is 0. For example, SELECT formatDateTimeInJodaSyntax(toDate('2012-05-29'), 'D') now correctly returns 150 instead of previously 15. #64614 (LiuNeng).