Fix not correcting Switch block numbers correctly #1207

Job	Run time
Tests / amd64-freebsd-native	4m 7s
Tests / amd64-mac-native	2m 43s
Tests / amd64-linux-gnu	2m 4s
Tests / amd64-linux-musl	2m 52s
Tests / arm64-mac-native	2m 13s
Tests / cargo-deny	37s
Tests / cargo-clippy	38s
Tests / cargo-fmt	26s
Tests / inko-fmt	58s
Tests / vale	16s
Nightly container	2m 40s
Standard library documentation	2m 17s
Documentation	41s
	22m 32s

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