fix head

git-svn-id: https://dev.geogebra.org/internal/moodle/moodle-qtype_geogebra/branches/MOODLE_27_STABLE@3771 872ce066-4876-4fca-a6fc-23b94bf576d1
fix head

git-svn-id: https://dev.geogebra.org/internal/moodle/moodle-qtype_geogebra/branches/MOODLE_27_STABLE@3772 872ce066-4876-4fca-a6fc-23b94bf576d1