removed duplicate route components from browser (#5584)

All routes '/', '/:bucket/', '/:bucket/*' render the same
component. Instead we could just have a single route like following which
combines all the above routes

'/:bucket?/*'

bucket is optional here, so it can cover '/'

browser/app/js/buckets/BucketList.js

@@ -34,6 +34,8 @@ export class BucketList extends React.Component {
       if (bucket) {
         setBucketList([bucket])
         selectBucket(bucket, prefix)
+      } else {
+        history.replace("/login")
       }
     }
   }