Filtering of sites for current page does not work with URLs that have port numbers

[robertknight]

Steps to reproduce:

1. Open a web page with username / password on localhost with a non-default port (eg. using python -m SimpleHTTPServer)
2. Open the extension UI and add a login for the current page
3. Save the login to go back to the account list

Expected result:

When the search filter bar is empty, the item list should show accounts for the current page by default, which should include only the newly added login.

Actual result:

All items shown, as if there were no item matching the current site.