SaveImage.sh bugfix - creating image.jpg

[EricClaeys]

When not saving daytime images, image.jpg wasn't getting updated.

[AndreasLMeg]

I think this is buggy (but not testet):

If you move the file ${IMAGE_TO_USE}, later use will fail
e.g.

...
mv "${IMAGE_TO_USE}" "${WORKING_DIR}/${FULL_FILENAME}"	# Websites look for $FULL_FILENAME
...
convert "${IMAGE_TO_USE}" -resize "${RESIZE_UPLOADS_SIZE}" -gravity East -chop 2x0 "${FILE_TO_UPLOAD}"