Subject: Remove unnecessary `image-tests--map-equal'

From: Joseph Turner <[email-masked]>
Date: Sat, 30 Mar 2024 12:44:14 -0700

With the resolution of bug#69992, it may be possible to remove the
`image-tests--map-equal' equality predicate from lisp/image-tests.el.

Eli and David, would you please apply the attached patch and then run
the tests to see if we still need to allow for tolerances in
`image--compute-map-and-original-map'?

The tests pass for me, but then again, they never failed on my machine...

Thank you!! I'm grateful for this fun collaboration. :)

Joseph