t6030: update to use test_i18ncmp

Since the git bisect output tested here is subject to translation, the
helper function test_i18ncmp should be used over test_cmp.

Signed-off-by: Vasco Almeida <vascomalmeida@sapo.pt>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t6030-bisect-porcelain.sh

@@ -803,7 +803,7 @@ test_expect_success 'bisect terms needs 0 or 1 argument' '
 	test_must_fail git bisect terms 1 2 &&
 	test_must_fail git bisect terms 2>actual &&
 	echo "no terms defined" >expected &&
-	test_cmp expected actual
+	test_i18ncmp expected actual
 '
 
 test_expect_success 'bisect terms shows good/bad after start' '
@@ -875,7 +875,7 @@ test_expect_success 'bisect start --term-* does store terms' '
 	Your current terms are two for the old state
 	and one for the new state.
 	EOF
-	test_cmp expected actual &&
+	test_i18ncmp expected actual &&
 	git bisect terms --term-bad >actual &&
 	echo one >expected &&
 	test_cmp expected actual &&