VFSPAK: Make Seek sanity check pak-relative. (#897) #362

Job	Run time
windows-build (windows-multi-x64)	11m 58s
linux-build (linux-x86_64)	2m 6s
macos-build (arm64)	5m 10s
macos-build (intel)	3m 3s
	22m 17s

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