js/slFlightDisplay: Remove unused style_function() function
js/slFlightDisplay: Remove unused style_function() function

RBE-Avionik/skylines,shadowoneau/skylines,kerel-fs/skylines,skylines-project/skylines,Turbo87/skylines,Turbo87/skylines,shadowoneau/skylines,Turbo87/skylines,shadowoneau/skylines,Harry-R/skylines,Turbo87/skylines,skylines-project/skylines,Harry-R/skylines,kerel-fs/skylines,Harry-R/skylines,RBE-Avionik/skylines,shadowoneau/skylines,kerel-fs/skylines,RBE-Avionik/skylines,skylines-project/skylines,Harry-R/skylines,RBE-Avionik/skylines,skylines-project/skylines