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=887f7a96a1c00f14ed8b2408363741942a6f4e4d
http://github.com/moodle/moodle/commit/887f7a96a1c00f14ed8b2408363741942a6f4e4d
+ 3.9 en [darkmode,tool_mobile]