Fix handling of case-mistyped commands #32372

Job	Run time
syntax	33s
tap syntax	7m 29s
cask audit	2m 55s
formula audit	5m 55s
test default formula (Ubuntu 22.04)	1m 55s
tests (online)	5m 34s
test default formula (Ubuntu 20.04)	3m 31s
update-test (Ubuntu)	19s
tests (generic OS)	3m 15s
vendored gems	42s
test default formula (macOS 13 x86_64)	3m 17s
update-test (macOS)	27s
tests (Ubuntu 24.04)	3m 23s
test default formula (macOS 15 arm64)	1m 18s
tests (Ubuntu 22.04)	3m 24s
tests (Ubuntu 20.04)	3m 42s
tests (macOS 13 x86_64)	9m 25s
tests (macOS 15 arm64)	5m 20s
	1h 2m 24s

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