Enable a few more tests in wxAnyTestCase::GetAs().

This is part of the continuing series of commits to find out what results in
heap corruption in wxOSX PPC builds.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73958 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Show the name of the actually tested class in text entry unit tests.

This test is used for several different classes, show the name of the class
being tested when the assert in Editable() test fails.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73959 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775