fix link color (microsoft#166713)

Author: aeschli

src/vs/platform/opener/browser/link.ts

@@ -11,6 +11,7 @@ import { Event } from 'vs/base/common/event';
 import { KeyCode } from 'vs/base/common/keyCodes';
 import { Disposable } from 'vs/base/common/lifecycle';
 import { IOpenerService } from 'vs/platform/opener/common/opener';
+import 'vs/css!./link';
 
 export interface ILinkDescriptor {
 	readonly label: string | HTMLElement;