fix shortcoming in ess-roxy where hide/show did not work in case of non-roxy comments outside functions

git-svn-id: https://svn.r-project.org/ESS/trunk@5958 0bbaf3bd-34e0-0310-bf65-c717079852d4
bugfix in ess-roxy hide/show

git-svn-id: https://svn.r-project.org/ESS/trunk@5959 0bbaf3bd-34e0-0310-bf65-c717079852d4