look inside :ref when searching for default for :map child #2358

Job	Run time
Babashka	32s
ClojureScript (none)	2m 58s
Clojure 11 (Java 8)	53s
ClojureScript (advanced)	3m 8s
Clojure 12 (Java 8)	55s
ClojureScript (cherry-none)	3m 28s
ClojureScript (cherry-advanced)	3m 24s
Clojure 11 (Java 11)	1m 3s
Clojure 12 (Java 11)	1m 2s
Clojure 11 (Java 17)	58s
Clojure 12 (Java 17)	57s
Clojure 11 (Java 21)	51s
Clojure 12 (Java 21)	52s
	21m 1s

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