Bug 9734 - String::Random is marked as optional, but C4::Members requires it

Bug 9734 - String::Random is marked as optional, but C4::Members requires it

jcamins confirmed on IRC it is not optional.

To test:
1) perl koha_perl_deps.pl -a |grep String::Random
2) notice the "No" in the last column - it should be Yes
3) apply patch and repeat same steps, looking for Yes.
4) prove t/Installer_PerlModules.t # which checks String::Random is required

Sponsored-by: software.coop
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>