New MediaWiki logo for the icon that represents the MediaWiki oauth provider.

Summary: Replaced the old logo with a new png.

Test Plan: I only tested that the new image was the same dimensions, format and filename as the old one.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D21661

Author: 20after4

resources/sprite/login_1x/MediaWiki.png

@@ -59,7 +59,7 @@
     "login-MediaWiki": {
       "name": "login-MediaWiki",
       "rule": ".login-MediaWiki",
-      "hash": "f1f0a9382434081a9a84e7584828c2dd"
+      "hash": "68eba44e85ea942ecf14d3c08992a2e2"
     },
     "login-PayPal": {
       "name": "login-PayPal",