t5616: use correct flag to check object is missing

If we want to check whether an object is missing, the correct flag to
pass to rev-list is --ignore-missing; --exclude-promisor-objects will
exclude any object that came from the promisor remote, whether it is
present or missing. Use the correct flag.

Signed-off-by: Jonathan Tan <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: jonathantanmy

t/t5616-partial-clone.sh

@@ -359,7 +359,7 @@ test_expect_success 'tolerate server sending REF_DELTA against missing promisor
 		--filter=blob:none $HTTPD_URL/one_time_sed/server repo &&
 
 	# Sanity check to ensure that the client does not have that blob.
-	git -C repo rev-list --objects --exclude-promisor-objects \
+	git -C repo rev-list --objects --ignore-missing \
 		-- $(cat deltabase) >objlist &&
 	test_line_count = 0 objlist &&