fix head

git-svn-id: https://dev.geogebra.org/internal/moodle/moodle-repository_geogebratube/branches/MOODLE_27_STABLE@3773 872ce066-4876-4fca-a6fc-23b94bf576d1
fix head

git-svn-id: https://dev.geogebra.org/internal/moodle/moodle-repository_geogebratube/branches/MOODLE_27_STABLE@3774 872ce066-4876-4fca-a6fc-23b94bf576d1