Revert "fetcher: Always open tmpfiles in repo location" #1267

Job	Run time
Build, minimum supported toolchain (MSRV)	4m 17s
build	2m 26s
build-no-features	2m 5s
build-git-libostree	4m 52s
cargo-deny	3m 30s
Lints, pinned toolchain	4m 3s
	21m 13s

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