run-aa-test: Fix call to csplit

New version of csplit from rust-coreutils fails with following error:

$ csplit R1.13a.1_bluez-spp.expected -f /tmp/EXPECT -b "%d" "/^## alternative ##$/" {*}
csplit: error: incorrect conversion specification in suffix

Replacing %d by %0d fixes it.

Signed-off-by: Frédéric Danis frederic.danis@collabora.com