textproc/py-zensical: Update to 0.0.50

• Remove no longer required patch.

Changelogs since 0.0.46:

https://github.com/zensical/zensical/releases/tag/v0.0.50
(There's no 0.0.49 release)
https://github.com/zensical/zensical/releases/tag/v0.0.48
https://github.com/zensical/zensical/releases/tag/v0.0.47

MFH: 2026Q3