www/py-calibreweb: update to 0.6.25

Port Changes:

• Remove GDRIVE option due to expired security/py-oauth2client
• Add missing uses for SSL and py-cryptography
• Fix descriptions and variables in rc script

Upstream Changelog: https://github.com/janeczku/calibre-web/releases/tag/0.6.25

PR: 289077
Reported by: Matthew Wener <matthew@wener.org> (maintainer)