Author: Mark Nelson
MDL-55062 tool_uploaduser: prevent defaults when not selected
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e4f1771a601e7252f7b45a0579281da62bef6c17
http://github.com/moodle/moodle/commit/e4f1771a601e7252f7b45a0579281da62bef6c17
+ 3.1 en [invalidupdatetype,tool_uploaduser]