Bug 25468: Preserve line breaks in hold notes

Bug 25468: Preserve line breaks in hold notes

In a hold note, line breaks are not preserved when viewing the note. A
note like:
--
Test 1

Test 2
--

will be rendered as:
--
Test 1 Test 2
--

Test Plan:
1) Place a hold with a note, use line breaks in the note.
2) Note the lines all run together when viewing the hold.
3) Apply this patch.
4) Reload the page.
5) Notes should now display with the original line breaks!

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Joy Nelson <joy@bywatersolutions.com>