Fix: URL in the announcement

When TCO18 site is accessed via https:// it fails to load any images.

Author: birdofpreyru

app/my-dashboard/notifications/news.json

@@ -5,7 +5,7 @@
     "headerExpand": "TCO18 Has Begun!",
     "detailsExpand": "Visit the new TCO18 Website for all the details and rules for each track.  Also be sure to frequently visit the Challenge Listings page for opportunity to earn TCO18 Points!",
     "backgroundImage": "tc-dashboard-tco18.png",
-    "redirectTo": "https://tco18.topcoder.com/",
+    "redirectTo": "http://tco18.topcoder.com/",
     "redirectText": "TCO18 Homepage",
     "live": false,
     "liveExpand": false,