WASHINGTON — The Supreme Court on Monday refused a request from tobacco companies to stop California from enforcing a ban on flavored tobacco products that was overwhelmingly approved by voters in November.R.J. Reynolds and other tobacco companies sought the high court’s intervention to keep the ban from taking effect by Dec. 21.There was no additional comment from the justices and no noted dissents.The ban was first passed by the state legislature two years ago but it never took effect after tobacco companies …