Bug 17190 - Marked REST API as mandatory (require = 1) in PerlDependencies.pm

Bug 17190 - Marked REST API as mandatory (require = 1) in PerlDependencies.pm

For testing I went in Staff client to Home > About Koha > tab  Perl modules
and verified that both Mojolicious (6.0) and Swagger2 (0.59) are marked
as mandatory.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit a900a434d50ae232af81c74c98020af3f13bf0e5)
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>