Fix X shift

[KristjanESPERANTO]

I always had a shift on the X-axis. This adjustment fixes the issue.

[mast4461]

I also noticed incorrect horizontal positioning of an icon, and I think the cause of the problem is that anchorRef.x matches the original size of the image, and isn't changed according to the icon size. I think the margin needs to account for the different sizes of the image and the icon, maybe like:

img.style.marginLeft = (-options.anchorRef.x / img.width * width) + 'px';

With this, if you had a 64px wide image (img.width) and an icon width of 32px (width), you'd get -options.anchorRef.x / 64 * 32 = -options.anchorRef.x * 32 / 64 = -options.anchorRef.x / 2.