Bug 24384: Add Access-Control-Allow-Origin support to OPAC reports svc

Bug 24384: Add Access-Control-Allow-Origin support to OPAC reports svc

This patch makes the opac/svc/report script use output_with_http_headers
so it sets the Access-Control-Allow-Origin header.

To test:
1. Create a new public report and remember the report id
2. Use your favourite too to fetch the report in JSON by issuing:
   GET http://localhost:8080/cgi-bin/koha/svc/report?id=1
=> FAIL: There is no Access-Control-Allow-Origin header
3. Apply this patch
4. Restart Plack
   $ sudo koha-plack --restart kohadev
5. Set the AccessControlAllowOrigin to anything (for example,
   https://koha-community.org)
6. Repeat 2
=> SUCCESS: On the response headers you find
Access-Control-Allow-Origin: https://koha-community.org
7. Sign off :-D

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>