Fix vertical alignment of `LayoutDebugBoxEdge`. #264

Job	Run time
miri	1m 11s
no_std	28s
build (ubuntu, stable, locked, true)	11m 34s
build (windows, stable, locked, false)	24m 27s
build (macos, stable, locked, false)	16m 35s
build (ubuntu, nightly, locked, false)	11m 25s
build (ubuntu, beta, locked, false)	11m 26s
build (ubuntu, stable, latest, false)	14m 23s
build (ubuntu, stable, minimal, false)	13m 21s
features	25m 43s
fuzz	15m 17s
deploy	5s
	2h 25m 55s

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