fix: vi editing_mode when updating instance path

[mugraph]

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Description

This PR makes sure the instance path is updated correctly, even if the user has editing_mode='vi' set in their ipython config, so far resulting in funky instance paths like .virtualenvs/mysite/var/instance$'\033'\[0\ q, effectively breaking assets build.

Related issue: #361

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[max-moser]

LGTM, thanks!

i quickly checked the other spots where invenio shell would be called (rg 'invenio.*\n?.*shell' -UC3 invenio_cli), and this seems to be the only place where we care about the command's output (beyond printing it out).

in the long run, i think @scossu's idea to use a simpler python interpreter (python over ipython) might be a broader fix.
however, this will do for the meanwhile.