Really fix wxUSE_PREFERENCES_EDITOR requirements check.

The changes of r74532 were incomplete/wrong and the fix of r74536 didn't
entirely fix the logic here, so try to do it again, hopefully correctly this
time.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74537 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775