fix #8666 - Add `amenity=clinic` to internal preset and default mapstyle

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5940 0c6e7542-c601-0410-84e7-c038aed88b3b
fix #8409 - Add missing `barrier`s values to internal presets (patch by skyper)

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5941 0c6e7542-c601-0410-84e7-c038aed88b3b