fix(_prepare.el): typo #1069

Job	Run time
test (ubuntu-latest, 26.3, false)	39s
test (ubuntu-latest, 27.2, false)	35s
test (ubuntu-latest, 28.2, false)	36s
test (ubuntu-latest, 29.4, false)	59s
test (macos-latest, 28.2, false)	1m 16s
test (macos-latest, 29.4, false)	1m 26s
test (windows-latest, 26.3, false)	2m 47s
test (windows-latest, 27.2, false)	1m 43s
test (windows-latest, 28.2, false)	1m 4s
test (windows-latest, 29.4, false)	1m 34s
test (ubuntu-latest, snapshot, true)	32s
test (macos-latest, snapshot, true)	1m 32s
test (windows-latest, snapshot, true)	1m 30s
	16m 13s

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