t/helper: remove dependency on `the_repository` in "proc-receive"
The "proc-receive" test helper implicitly relies on `the_repository` via
`parse_oid_hex()`. This isn't necessary though, and in fact the whole
command does not depend on `the_repository` at all.
Stop setting up `the_repository` and use `parse_oid_hex_any()` to parse
object IDs.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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