x11-themes/zorin-gtk-themes: Update 4.2.1 => 4.2.2

Verison 5 looks quite unpleasant on XFCE now.
Lets stick to latest version of 4 now.

Changelog:
https://github.com/ZorinOS/zorin-desktop-themes/releases/tag/4.2.2

While here replace CP with COPYTREE_SHARE.

PR: 289573