convert has_sha1_file() callers to has_object_file()

convert has_sha1_file() callers to has_object_file()

The only remaining callers of has_sha1_file() actually have an object_id
already. They can use the "object" variant, rather than dereferencing
the hash themselves.

The code changes here were completely generated by the included
coccinelle patch.

Signed-off-by: Jeff King <redacted>
Signed-off-by: Junio C Hamano <redacted>