x11-themes/win98se-icon-theme: Update 0.2.15 => 0.2.16.1

Changelogs:

• https://github.com/nestoris/Win98SE/releases/tag/v0.2.16
• https://github.com/nestoris/Win98SE/releases/tag/v0.2.16.1

PR: 298100
Reported by: Alexander Vereeken <avereeken@fastmail.de> (maintainer)
Approved by: osa, vvd (Mentors, implicit)