Bug 16232: Fix edit as new in Rancor

Bug 16232: Fix edit as new in Rancor

When you edit a biblio as new, and you have enabled advanced editor,
current record was opened, and was overwritten when saved. This patch
effectively opens a new record based on the one selected.

To test:
1) Enable "EnableAdvancedCatalogingEditor" preference
2) Go to cataloguing and click on advanced editor to save preference to the cookie
3) Search for an item in catalog
4) Click in "Edit as new (duplicate)"
5) Advanced editor should appear.
CHECK => browser url ends with #catalog/{original biblionumber}
      => Title above toolbar is "Editing catalog record #{original biblionumber}"
6) Apply this patch
7) Repeat steps 3 to 5
SUCCESS => browser url ends with #duplicate/{original biblionumber}
        => Title above toolbar is "Editing duplicate record of #{original biblionumber}"
8) Save
SUCCESS => browser url ends with #catalog/{new biblionumber}
        => Title above toolbar is "Editing catalog record #{new biblionumber}"
9) Sign off

Sponsored-by: Carnegie
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>