Bug 23409: show borrowernotes and opacnote's lines feeds

Bug 23409: show borrowernotes and opacnote's lines feeds

Test plan:
  - Fill borrowernotes and opacnote with lines separated by lines
    endings,
  - save and check the content is displayed on a single line,
  - apply this patch,
  - check lines endings are displayed

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>