Merge pull request #9198 from pivanov/bug-808250

Bug 808250 - In Display settings, the icons for brightness slider seem flipped to people (followup) r=samjoch

(cherry picked from commit b65dbaace1bfc940db6f10aee6ad3c54187d25aa)

Conflicts:
	apps/settings/style/images/range_icons_brightness_min@2x.png