fedora packaging: Fix copr-publish.sh
fedora packaging: Remove "make copr-publish"

We have "copr-publish.sh <source rpm>" instead, which is more flexible
because you can specify a previously-built source rpm instead of
publishing the currently checked out version of stb-tester. This way you
can have fixes to the copr-publish script that are after the stb-tester
tag you want to publish.