fuzz: allow max size conditional ACE round-trip failure

fuzz: allow max size conditional ACE round-trip failure

The encoder, being cautious not to overstep the arbitrary 10000 byte
boundary, might not encode an exactly 10000 byte condition. This
is an off-by-one, but in the safe direction.

Credit to OSS-Fuzz.

REF: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=65118

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
Autobuild-User(master): Andrew Bartlett <abartlet@samba.org>
Autobuild-Date(master): Fri Dec 22 00:51:13 UTC 2023 on atb-devel-224