Bug 1093766 - Change background color for about dialog on aurora;r=jaws

browser/branding/aurora/content/aboutDialog.css

@@ -5,7 +5,7 @@
 #aboutDialogContainer {
   background-image: url("chrome://branding/content/about-background.png");
   background-repeat: no-repeat;
-  background-color: rgb(19,8,36);
+  background-color: rgb(26,58,99);
   color: #fff;
 }