Mayor Joseph M. Butler on Tuesday night received no support for expanding a policy that began in November that no longer allows firefighters to fill in for colleagues who call in sick. Mayor Butler wanted to expand the policy to prohibit firefighters from being called in to work if their colleagues are on vacation, have scheduled time off or are on bereavement leave. He contended that a recent Supreme Court decision no longer requires the city to have 15 firefighters on duty at all times, so the city could move ahead with expanding the policy. But none of the City Council members would go along with the proposal on Tuesday night. In disagreeing with the mayor, Councilwoman Lisa A. Ruggiero said the Watertown Professional Fire Fighters Association Local 191 could win a court appeal that overturns Judge James P. McClusky’s Jan. 16 decision.