viz: Update index routes to observe mercury state.

It was passing along the unobserved state to browse.createUrl, which is wrong.

Change-Id: I60905ff84dfbeabb9801a33a1bb778132061522d
diff --git a/src/routes/index.js b/src/routes/index.js
index 273720a..ee4e506 100644
--- a/src/routes/index.js
+++ b/src/routes/index.js
@@ -18,7 +18,7 @@
 
     // Redirect to browse
     events.navigation.navigate({
-      path: browseRoute.createUrl(state.browse, {
+      path: browseRoute.createUrl(state.browse(), {
         namespace: index
       })
     });
@@ -27,7 +27,7 @@
 
     // Redirect to browse
     events.navigation.navigate({
-      path: browseRoute.createUrl(state.browse, {
+      path: browseRoute.createUrl(state.browse(), {
         namespace: index
       })
     });