[form] only set __form_id for the main form, not for sub-forms. Should fix regression introduced by 4668:9f82f81bf13d
# -*- shell-script -*-
###############################################################################
#
# put here information about external resources used by your components,
# or to overides existing external resources configuration
#
###############################################################################
# CSS stylesheets to include in HTML headers
# uncomment the line below to use template specific stylesheet
# STYLESHEETS = DATADIR/cubes.%(cubename)s.css