cli: fix legacy parser options for Py3.9.8 (Sopel 7.1.x) #2211
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Description
The hack adds a prefix to the "dest" of the legacy options added to the main parser. It works because these options are not actually used by the legacy subparser: they exists only to trick the help message into something usable by end-users. It's rather ugly, but at this point we already know that the "legacy" subparser trick is ugly.
We are only fixing the issue introduced by Python 3.9.8 that "fixed" something in argparse that broke our use-case. Let's not delve into that for now.
Should fix #2210
Checklist
make qa
(runsmake quality
andmake test
)