Bug 26975: Reindent authorities editor template

Bug 26975: Reindent authorities editor template

This patch performs general template cleanup to the authorities editor:
Make indentation consistent, replace tabs with spaces, and trim trailing
whitespace.

To test, apply the patch and edit or create a new authority record. Test
the functionality of the authority editor and confirm that everything
works correctly, including JS interactions like subfield reordering, tag
and subfield cloning, and tag and subfield deletion.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>