OTTAWA-CP-With a simmering mutiny plot in the backbenches and four more cabinet ministers deciding not to seek re-election, Prime Minister Justin Trudeau’s attempt to right the Liberal ship and stay on as captain is becoming more challenging. Trudeau is expected to shuffle his cabinet again after the ministers informed the Prime Minister’s Office they won’t be running in the next election. Filomena Tassi, the minister responsible for the Federal Economic Development Agency for Southern Ontario, announced Thursday she won’t be running for personal reasons. Sports Minister Carla Qualtrough also issued a statement that she won’t be seeking re-election. She offered few details except to say that it is time for her to move on and she is excited to see what comes next. She also thanked her family and the…