multimedia/gaupol: Update 2.0 => 2.0.1

While here, use shebangfix instead.

Changelog:

• Fix theming related hang on startup with GTK ≥ 4.23.1 (#249)
• Drop support for the general.theme config file option with GTK < 4.20

https://github.com/otsaloma/gaupol/releases/tag/2.0.1

Reported by: portscout
Approved by: osa, vvd (Mentors, implicit)