Bug 19957: Allow continued editing of report after saving

Bug 19957: Allow continued editing of report after saving

To test:
 1 - Edit or create a report
 2 - Save it
 3 - Note the report is saved but you can't keep editing
 4 - Clicking 'Edit' returns you to editing
 5 - Apply patch
 6 - Save report
 7 - Note success message remains, but report is still open for editing
 8 - Note when you click the saved/updated message dissappears
 9 - Try again after inserting erros into report (No Select, bad
        authorised value, etc.)
10 - Note errors stil display as expected
11 - Verify message works on update of existing report and save of new
      new report

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Charles Farmer <charles.farmer@inLibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Joubu: amended patch to fix alignment

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>