[FrameworkBundle] Highlight error logs in red and not green

src/Symfony/Bundle/FrameworkBundle/Resources/public/css/exception.css

@@ -99,7 +99,7 @@ build: 56
 .sf-exceptionreset #logs .traces em
 {
     font-style:normal;
-    color:#aacd4e;
+    color:#AA3333;
     font-weight: bold;
 }