Don't clear filter when duplicating

When duplicating a host, after saving the host the search field filter remains however the host list reverts to being unfiltered. It would be nice if this didn't revert and instead stayed filtered.

REPRODUCE:

1. Filter the host list by searching for some subset of hosts
2. Right click the host and select Duplicate
3. Save the host
4. Note that the host list is no longer filtered, however the search box still shows the search term