11.0/trisquel-icon-theme: add missing ayatana-settings icon for trisquel theme.

ubuntu-mate-default-settings defines a .desktop file that overrides the ayatana-settings one. So the ubuntu-mate can customize using their own icon through default ubuntu-mate themes.

Using the default ayatana-settings icon on the default trisquel one prevents a broken icon, when using trisquel themes (light or dark).

11.0/trisquel-icon-theme/debian/changelog

 trisquel-icon-theme (11.0-5) aramo; urgency=medium
 
-  * Fix missing scalable ayatana-settings icon for custom trisquel
-    theme.
+  * Add missing ayatana-settings icon for trisquel theme
 
  -- Trisquel GNU/Linux developers <trisquel-devel@listas.trisquel.info>  Sat, 18 Nov 2023 22:08:55 -0600