zone id patch (seq5)

[Newby]

I noticed showeq wasn't picking up the maps correctly when zoning into some instance (missions). I think this should fix it, but I haven't tried it on all missions yet. Feedback welcome.

This was made against seq5's source tree. Should be easy to incorporate into seq6.

[cn187]

Thanks Newby! I've commited this to the SEQ5 trunk and the pre_6_0_beta branch.

[BlueAdept]

Thanks Newby