Bug#773426: imagemagick: Desktop file does not open the Imagemagick application

[Jeremy Bicha]

I believe the fix is wrong.

--nostdin needs two dashes not just one.

https://anonscm.debian.org/git/collab-maint/imagemagick.git/commit/?h=debian/6.9.7.4%2bdfsg-2&id=f9b7075

Thanks,
Jeremy Bicha