api/views/json: Remove unused "header" parameter
api/views/json: Remove unused "header" parameter

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