WASHINGTON — Supreme Court nominee Amy Coney Barrett is vowing to bring no “agenda” to the court, batting back senators’ questions Tuesday on abortion, gun rights and the November election, insisting she would take a conservative approach to the law but decide cases as they come.“Judges can’t just wake up one day and say I have an agenda, I like guns, I hate guns, I like abortion, I hate abortion and walk in like a royal queen and impose their will on the world,” Barrett said at the second day of confirmation hearings …