Fix issue where sometimes bulkEdited is disabled.

This was occurring because a raw search only has items in it’s URI, but
not works or copies. So on a new search where works and copies are
selected, on hitting search they would not be propogated though.
Fix issue where if checkboxes are selected and then a user hits 'search' the new result does not have the items selected.
Merge pull request #621 from nla/bug/acm-dsc-585

Fix selected checkboxes sticking (so that they will stick)