cad/qucs-s: Update 25.1.2 => 25.2.0

Summary:
Changelogs:

• https://github.com/ra3xdh/qucs_s/releases/tag/25.2.0

• Fix LICENSE to match stated in "Help/About Qucs-S/License" dialog.

Approved by: yuri@ (Mentor)

Differential Revision: https://reviews.freebsd.org/D52409