flights: Use nav-pills instead of nav-tabs
flights: Use nav-pills instead of nav-tabs

Be consistent with the other pages

RBE-Avionik/skylines,skylines-project/skylines,snip/skylines,dkm/skylines,kerel-fs/skylines,Harry-R/skylines,RBE-Avionik/skylines,TobiasLohner/SkyLines,dkm/skylines,Harry-R/skylines,RBE-Avionik/skylines,skylines-project/skylines,kerel-fs/skylines,snip/skylines,Turbo87/skylines,shadowoneau/skylines,kerel-fs/skylines,skylines-project/skylines,Turbo87/skylines,shadowoneau/skylines,Turbo87/skylines,dkm/skylines,TobiasLohner/SkyLines,snip/skylines,shadowoneau/skylines,TobiasLohner/SkyLines,RBE-Avionik/skylines,Harry-R/skylines,Turbo87/skylines,Harry-R/skylines,skylines-project/skylines,dkm/skylines,shadowoneau/skylines