Navbar tag: Add parameter signature.

Change-Id: If38e971210544ece6e62e8cba277d26c8f1be915
diff --git a/src/main/resources/templates/tags/navbar.html b/src/main/resources/templates/tags/navbar.html
index b3d12d8..b78a658 100644
--- a/src/main/resources/templates/tags/navbar.html
+++ b/src/main/resources/templates/tags/navbar.html
@@ -1,3 +1,5 @@
+{@java.lang.String siteSection}
+
 <ol>
   <li class='{#if siteSection == "Bookmarks"}this-page{/}' data-site-section="Bookmarks"><a href="/bookmarks">Bookmarks</a></li>
   <li class='{#if siteSection == "Lazy Chat"}this-page{/}' data-site-section="Lazy Chat"><a href="/lazychat">Lazy Chat</a></li>