preserve rotations after resizing

[corbanvilla]

Description of changes: Modify resize operation to also preserve rotations. Otherwise if the original image rotation is stored in the EXIF data, the resized will not be oriented correctly.

See

• https://sharp.pixelplumbing.com/api-operation
• https://stackoverflow.com/questions/48716266/sharp-image-library-rotates-image-when-resizing

[achrafsouk]

Thanks for this proposal! shouldn't we rotate before actually resizing?

[corbanvilla]

@achrafsouk good call, just updated that :)