[lmi] wx wine non-anomaly

[Greg Chicares]

This is curious but not anomalous, and I don't know whether or not it's
really interesting to anyone but me.

Since I abandoned msw, I've run msw builds of lmi only under wine, and
the not-an-emulator runs lmi almost perfectly, but there's one problem
that actually makes lmi really hard to use: the "Policy" listbox's
contents are shown in a seemingly random order. I've borne this stoically
for many months, but today I decided I had to fix it, and it turned out
to be surprisingly easy:

-                        <style>wxLB_SINGLE</style>
+                        <style>wxLB_SINGLE|wxLB_SORT</style>

The curiosity is that the listbox contents seem always to have been
sorted on a native msw platform. (Or, conceivably but not likely, they
were listed in the corresponding files' timestamp order, which happened
to be alphabetical elsewhere in the past, but isn't now, perhaps due to
SSD queuing...but that seems far-fetched.)

I was sure that wxLB_SORT must have been specified more than a decade
ago, because it always looked that way, and therefore I was unable to
see that wxLB_SORT was missing until I looked for it specifically.

I'll add wxLB_SORT to all '*.skin' files soon.