Bug 9957 - Missing cancel link on subfield editing page

Bug 9957 - Missing cancel link on subfield editing page

The subfield edit page has an edit bottom at the top of the page. Almost
no other edit screens do this. It would be more consistent to put it at
the bottom. Also missing is a "cancel" link. This patch fixes both
issues.

The patch also adds "Default" to the breadcrumbs when editing a subfield
in the default framework.

To test, apply the patch and edit a subfield: MARC frameworks -> MARC
structure -> Subfields -> Edit. The "Save changes" button should appear
at the bottom of the page alonside a "Cancel" link. Both should work
correctly.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Template change only, improves consistency and works
nicely.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
(cherry picked from commit 559ff89fd641df9a67fe6fc53efdc49854ccdd1c)

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>