net-mgmt/rubygem-oxidized-web: Fix dependency on puma

• Match gemspec dependency and RUN_DEPENDS for puma
• portfmt-ize

PR: 253266
Submitted by: Nick Hilliard <nick@foobar.org> (maintainer)
Reported by: Einar Bjarni Halldórsson <einar@isnic.is>
Reviewed by: osa (mentor)
Approved by: osa (mentor)
Differential Revision: https://reviews.freebsd.org/D29247