Bug 37724: Remove Koha version number from OPAC

Bug 37724: Remove Koha version number from OPAC

This change removes the Koha version number from the OPAC generator
metadata.

Test plan:
0. Apply patch
1. Enable syspref SelfCheckInModule
2. Visit /cgi-bin/koha/opac-main.pl and confirm meta tag doesn't
include version number
3. Visit /cgi-bin/koha/sci/sci-main.pl and confirm meta tag doesn't
include version number
4. Visit /cgi-bin/koha/sco/sco-main.pl) and confirm meta tag doesn't
include version number
5. Click "Help" and confirm meta tag doesn't include version number

Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 6524913f142a9b7dc17a8974b8097f6089f8ff8b)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>