Bug 11704: Make */svc/report print the correct headers

Bug 11704: Make */svc/report print the correct headers

To test:
1 - Go through the first comments instructions to reproduce
    and verify the bug is present (OPAC and STAFF)
2 - Apply the patch
3 - Repeat step 1 and notice
   * characters are not broken anymore
   * the header is correct
4 - Sign off

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit aace5d436dbab1f13e2e1c06d0b4ed5f1ec13ced)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>