Ensure lightbox resizes check both maxw and maxh.

Cleaning up a detail for [#53567745].

https://www.pivotaltracker.com/story/show/53567745
Revert "Put close button on the left for color box"

This reverts commit 7144736cc781f59d40b0a32ef70531f1996e0701.
Hide and restore "saving" box to keep close button on right.

Moving the close button to the left was undesirable from a UI standpoint, so instead we're setting it to "display: none" when we open the lightbox, then restoring the setting when we close the lightbox. [#53567745]

https://www.pivotaltracker.com/story/show/53567745