remove gnome-desktop-item-edit

This was used by alacarte, but now it has been replaced with their own file editor:
alacarte@968c81bf
1 job for master in 6 minutes and 3 seconds
Status Job ID Name Coverage
  Build
failed #104968
build-ubuntu

00:06:03

 
Name Stage Failure
failed
build-ubuntu Build
make[4]: *** [Makefile:1000: gnome_panel-applet.o] Error 1
make[3]: *** [Makefile:1439: all-recursive] Error 1
make[3]: Leaving directory '/builds/GNOME/gnome-panel/gnome-panel'
make[2]: *** [Makefile:699: all] Error 2
make[2]: Leaving directory '/builds/GNOME/gnome-panel/gnome-panel'
make[1]: Leaving directory '/builds/GNOME/gnome-panel'
make[1]: *** [Makefile:540: all-recursive] Error 1
make: *** [Makefile:472: all] Error 2
ERROR: Job failed: exit code 1