Bug 27487: Rename system preference reviewson to OPACComments

Bug 27487: Rename system preference reviewson to OPACComments

This patch renames the reviewson system pref to OPACComments

Test Plan:
1. In Koha Administration, search for the reviewson system preferance
2. Note the presence of the reviewson system preferance
3. Apply the patch and run updatedatabase.pl
4. Repeat steps 1 and 2. The reviewson preferenace should be gone
5. Seach for and note the OPACComments system preferance
6. Ensure that the OPACComments system preferance operates correctly, as
if it were reviewson

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
https://bugs.koha-community.org/show_bug.cgi?id=27484

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