Updated mediawiki/skins
Project: mediawiki/skins/Nimbus  f0f6cc8024c8d0d197a03f463ab77efe65c63eef

Removed two LoginReg and one SystemGifts CSS rules

The LoginReg rules are irrelevant because LoginReg was superseded by
NewSignupPage years ago and the SystemGifts rule is present in
/extensions/SocialProfile/SystemGifts/SystemGift.css

Change-Id: Id7727cacb81496ffd44754e8322e636c053dc794