Bug 26013: Fix formatting for dates on "Manage stage MARC records" page

Bug 26013: Fix formatting for dates on "Manage stage MARC records" page

The "staged" dates were not formatted according to system
preferences DateFormat and TimeFormat as the appropriate TT
filters were missing.

To test:
- Stage a record in MARC format
- Go to Staged MARC management
- Check the date in the list of imports
- Click on the import and check the "Staged:" date
- Apply patch
- Repeat and verify formatting is now correct

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Joonas Kylmälä <joonas.kylmala@helsinki.fi>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>