Disable NumValidatorTestCase::Interactive() for build bot slaves.

Disable NumValidatorTestCase::Interactive() for build bot slaves.

This test consistently fails on the MSW build slave machines (see e.g.
http://buildbot.tt-solutions.com/wx/builders/XPSP2 VC9 wxMSW trunk release/builds/2084/steps/test/logs/stdio)
for unknown reason so disable it for them. Notice that it does pass when ran
locally so it looks like another instance of a problem with wxUIActionSimulator
on these machines rather than the problem with the class itself.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67046 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775