A lawmaker fighting to keep his seat in Hong Kong’s legislature has asked a top court to review a landmark ruling on the barring of election candidates.The bid from pro-democracy politician Au Nok-hin came as two legal sources said the government was not planning to appeal their defeat in that case, in which a judge overturned the decision to ban prominent activist Agnes Chow Ting from running in a Legislative Council by-election last year.The Post has learned another pro-democracy lawmaker…