Remove dead snakes from vOrg.from_jcal and vOrg.from_ical

[stevepiercy]

Remove dead snakes from vOrg.from_jcal and vOrg.from_ical.

Originally posted by @stevepiercy in #1589 (comment)

See also #698.

[github-actions]

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GitHub user: stevepiercy
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        name: Steve Piercy
        company: Steve Piercy - Website Builder
        blog: https://stevepiercy.com/
        location: Eugene, OR
        bio: Contributor to open source projects icalendar, Plone, Pyramid, and Deform. Everyday cyclist. Backyard farmer. Tree hugger. Living simply.
        mastodon: https://fosstodon.org/@stevepiercy
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      Orgs: plone, collective, Pylons, zopefoundation, knop-project, pycalendar

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