Bug 798437. Fix Social.jsm url in aboutSocialError.xhtml. r=felipe

browser/base/content/aboutSocialError.xhtml

@@ -35,7 +35,7 @@
     const Cu = Components.utils;
 
     Cu.import("resource://gre/modules/Services.jsm");
-    Cu.import("resource://gre/modules/Social.jsm");
+    Cu.import("resource:///modules/Social.jsm");
 
     let config = {
       tryAgainCallback: reloadProvider