Author: Dani Palou
MDL-67806 tool_mobile: Add Dark mode option in disabled features
We must allow site admins to remotely disable that feature in the app
http://git.moodle.org/gw?p=moodle.git;a=commit;h=bb0a08a7b438165382735f05b4ad7bf21db4a82d
http://github.com/moodle/moodle/commit/bb0a08a7b438165382735f05b4ad7bf21db4a82d
+ 3.8 en [darkmode,tool_mobile]