specdep: Fix default value for --dist argument
specdep: Fix default value for --dist argument

Signed-off-by: Euan Harris <c3b6e83069c8e9e3af49a38fec6026be89559638@citrix.com>

djs55/planex,simonjbeaumont/planex,djs55/planex,djs55/planex,simonjbeaumont/planex,simonjbeaumont/planex