Trace pixel art ignores width/height of the traced image

[Patrick Storz]

Just noticed that when tracing pixel art and using a resized image (i.e. width/height not equal to the actual pixel width/height of the image) the result will have a different size as the traced image.

Obviously only a minor issue, but applying an appropriate transform to the created group should be easy and is probably the expected result for most users

(Inkscape 0.92.2 on Windows 10)