desktuils/fet: update to 5.40.3

Changelog:

• Added virtual rooms, which give the possibility for the user to

	  specify more rooms for an activity, or to choose between a large room
	  or more smaller rooms for an activity, and might open the
	  possibilities for other kinds of usage. Suggested by math on the
	  forum, who had some very useful ideas.

• Various rare but important bug fixes concerning the new feature of

	  virtual rooms.

• Small memory leak bug fixed (when reading incorrect files with

	  virtual rooms).

• Minor fixes and improvements.
• Added a new example file from Greece, by dimzev.

• removed kde from CATEGORIES

PR: 241669
Submitted by: Zsolt Udvari <uzsolt@uzsolt.hu> (maintainer)