Cropper result image extention as original

[CodingJediKnight]

When you use the cropper, the result image always in .png.

I suggest it will be better to save at the same extention as original image is.

cropperjs lib, that orchid use to crop on frontend can save in different extentions, but orchid just don't use that feature. https://github.com/fengyuanchen/cropperjs#getcroppedcanvasoptions