Revert "Halo: Add master switch to disable Halo (2/2)"

This reverts commit a36d21e58a0c1ee68bf2b0041656ae3f7c827fbe.
Revert "[1/2] Settings: HALO"

This reverts commit ba9de7f438fea0ac14fe529637ffe8cc7708bcee.

Conflicts:
	res/values/djl_arrays.xml
	res/values/djl_strings.xml
	res/xml/settings_headers.xml