message: fix typo in desktop file
diff: -{Desktop Entry]
  +[Desktop Entry]
  Type=Application
  Version=1.0
  Name=Lumina-XDG-Entry
  @@ -7,5 +7,5 @@ Comment=
  Icon=
  Terminal=false
  Exec=/usr/local/bin/lumina-xdg-entry
  -Categories=Utility;;
  +Categories=Utility;
  Keywords=
  