games/omega: Fix inventory display crash and take maintainership

PR: 259786
Reported by: Alex <r7st.guru@gmail.com> (new maintainer)
Approved by: portmgr (blanket: bugfix, unmaintained port)
MFH: 2021Q4

(cherry picked from commit dfc806ae70f1cd36860b6b90e4185d2198446f7a)