Bug 35349: Reindent label item search template

Bug 35349: Reindent label item search template

This patch reindents the label item search template so that it has
consistent indentation. These changes should have no visible effect on
the page.

To test, apply the patch and go to Cataloging -> Label creator.

- Click New -> Label batch.
- Click the "Add items" button under the form.
- A "Search for items" window should pop up.
- The form should look correct, and work as it did before the patch.

Viewing the diff while ignoring whitespace changes should show only
places where a line break was added.

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
(cherry picked from commit ee6fe93274e0e46e91a584272237e535284673f8)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>