“Paddington 2,” the charming and funny follow-up to the charming and funny and money-making 2014 “Paddington,” opens with a surprise: a back story for the fuzzy, little, good-natured, oh-so-polite young bear who, in the first film, made his way from the peaceful jungles of Peru to the bustle of London, and a whole new way of life as part of the Brown family.It quickly jumps to the present, where Paddington (voice of Ben Wishaw) has settled in with slightly [...]