fix(env): remove misleading PATH position check in `vp env doctor` #6638

Job	Run time
optimize-ci	3s
detect-changes	4s
Lint	49s
download-previous-rolldown-binaries	10s
Test (Linux x64 musl)	2m 48s
Test (windows-latest, x86_64-pc-windows-msvc)	3m 49s
Test (namespace-profile-mac-default, aarch64-apple-darwin)	1m 2s
Test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	1m 22s
CLI E2E test (Linux x64 musl)	3m 17s
CLI E2E test (windows-latest, x86_64-pc-windows-msvc)	7m 1s
CLI E2E test (namespace-profile-mac-default, aarch64-apple-darwin)	2m 29s
CLI E2E test (namespace-profile-linux-x64-default, x86_64-unknown-linux-gnu)	2m 57s
Local CLI `vp install` E2E test	0s
done	4s
	25m 55s

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