deskutils/fet: update to 5.46.0

From ChangeLog: https://www.lalescu.ro/liviu/fet/news.html

• Added a new feature to create easier overlapping groups/years, from the

subgroups/groups dialogs (suggested by samantha.goddard's file).

• Added the possibility of executing an external command after the generation

(suggested by Zsolt Udvari and other users). The implementation of this feature
was inspired by the Claws Mail software.

• Added a new example file from Hong Kong, by Marcus.

While here, reorder out of place variables.

PR: 248724
Submitted by: uzsolt@uzsolt.hu (maintainer)