frontend: Fix URL for the 'Code Coverage' text in the header (#300)

Author: marco-c

frontend/src/base.html

@@ -147,7 +147,7 @@ <h2>
 <header>
   <div class="logo">
     <img src="<%=require('../assets/moz-logo-black.png')%>" alt="Moz://a"/>
-    <a href="#view=browser">Code Coverage</a>
+    <a href="#view=directory">Code Coverage</a>
   </div>
   <div id="menu"></div>
 </header>