multimedia/webcamd: Update to last commit, set maintainer

Commit log:
https://github.com/hselasky/webcamd/compare/v5.17.1.2...5e085e4

• Allow starting with -c for loopback virtual camera.
• Update to last commit (2 small commits).
• Fix warnings from portclippy.
• Parametrize webcamd with ${PORTNAME}.
• Split long lines.

PR: 295677
Sponsored by: UNIS Labs
Co-authored-by: Nicolas Goy <me@kuon.ch>