deskutils/lookbook: update to 2.0.0

ChangeLog: https://github.com/elementary/iconbrowser/releases/tag/2.0.0

 * Fancy new icon
 * Drag the window from anywhere
 * Follow the system dark style preference
 * Updated for Gtk 4

Move the port to its official name.
Mantainer MIA for some time now with this and other ports.

PR:		266839
Reported by:	duchateau.olivier@gmail.com
Approved by:	greg@unrelenting.technology (maintainer, timeout)