U.S. Rep. Barney Frank said yesterday he has “no regrets” about his role in helping a troubled Boston bank qualify for a $12 million federal bailout now at the center of ethics charges against California Rep. Maxine Waters. In fact, Frank - chairman of the powerful House Financial Services Committee - says he never helped OneUnited at the behest of Waters, whose husband had served on the bank’s board. Instead, the Bay State congressman said he worked to promote the bailout at the request of scandal-plagued then-state Sen. Dianne Wilkerson. “I was already working on behalf of OneUnited, I was...