Allow opening editor from DarkConsole error log

Test Plan:
Click on "passing a null index to idx()" in DarkConsole.
Click on entry in stack trace.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Koolvin

Differential Revision: https://secure.phabricator.com/D2275

webroot/rsrc/css/aphront/dark-console.css

@@ -13,6 +13,10 @@
   z-index:        1;
 }
 
+.dark-console a:link {
+  color: inherit;
+}
+
 .dark-console-tabs {
   width:        180px;
   background:   #222222;