applets/kicker: Remove unused commands from Messages.sh
Summary: "find . -name \*.rc -o -name \*.ui -o -name \*.kcfg" returns 0 files.
Test Plan: Run extract-messages.sh, compare the resulting .pot file.
Reviewers: ltoscano, bshah, davidedmundson
Reviewed By: davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D24063