t5505: add missing &&

Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5505-remote.sh

@@ -371,7 +371,7 @@ test_expect_success 'update --prune' '
 	 git branch -m side2 side3) &&
 	(cd test &&
 	 git remote update --prune &&
-	 (cd ../one && git branch -m side3 side2)
+	 (cd ../one && git branch -m side3 side2) &&
 	 git rev-parse refs/remotes/origin/side3 &&
 	 test_must_fail git rev-parse refs/remotes/origin/side2)
 '