Fix uniconizing hidden top level windows in wxMSW.

Fix uniconizing hidden top level windows in wxMSW.

wxTLW wasn't properly restored if Iconize(false) was called while the window
was hidden.

Fix this by adding yet another special case to wxTopLevelWindowMSW::Show().
This makes it even less comprehensible than before but there doesn't seem to
be any obvious way to simplify this code without totally changing it.

Closes #14539.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72295 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775