Interaction with *print-namespace-maps* and js objects with slash in property name

fixed https://github.com/clojure/clojurescript/commit/8fe844e8bd3fe1cce2d775c9bd3d49edbbc51ed4

I don't think Enzzo patch has any big perf implications. Looks good to me, thanks.

I just signed
I write one more test for nested case.
Not sure if should be a comment on "(map? m)" saying "When it a javascript map, we should not try to lift ns"
I do not test this feature. Still reading about how to test.

Enzzo: I suspect your patch has better behavior. (There might be a perf concern with any of these patches, given the area of code being changed.) Yes, I would propose adding a test.

Also, have you signed the C/A. (Your name doesn't appear to be listed here https://clojure.org/community/contributors)

I think that my PATCH will do

` #js {:foo/bar #:baz{:quux 3}} `

, not?
Should there be a test covering it?