Update .gitmodules to remove the enrol/ilios plugin

removed the following lines are requested by reviewer:
[submodule "enrol/ilios"]
	path = enrol/ilios
	url = https://github.com/ilios/moodle-enrol-ilios
	branch = MOODLE_404_STABLE

.gitmodules

@@ -30,10 +30,6 @@
 	path = admin/tool/ucsfsomapi
 	url = https://github.com/ucsf-education/tool_ucsfsomapi.git
 	branch = MOODLE_404_STABLE
-[submodule "enrol/ilios"]
-	path = enrol/ilios
-	url = https://github.com/ilios/moodle-enrol-ilios
-	branch = MOODLE_404_STABLE
 [submodule "local/maintenance_livecheck"]
 	path = local/maintenance_livecheck
 	url = https://github.com/moodle-an-hochschulen/moodle-local_maintenance_livecheck