Remove redundant z= binding from visual-state-map #685

Job	Run time
build (ubuntu-latest, 26.3, false)	34s
build (ubuntu-latest, 27.2, false)	34s
build (ubuntu-latest, 28.2, false)	33s
build (ubuntu-latest, 29.3, false)	50s
build (macos-latest, 28.2, false)	1m 50s
build (macos-latest, 29.3, false)	2m 49s
build (windows-latest, 26.3, false)	1m 36s
build (windows-latest, 27.2, false)	56s
build (windows-latest, 28.2, false)	43s
build (windows-latest, 29.3, false)	3m 26s
build (ubuntu-latest, snapshot, true)	34s
build (macos-latest, snapshot, true)	2m 27s
	16m 52s

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