Bug#886020: wrong help message

[VA]

Version: 1.0-1.2+b2
Package: gnome-xcf-thumbnailer

When I try to display gnome-xcf-thumbnailer help, it tells me about NDS 
files, not XCF:

% gnome-xcf-thumbnailer -h
Usage:
  gnome-xcf-thumbnailer [OPTION?] [FILE...] Thumbnail Nintendo DS ROMs