comctl32/tests: Added a test that checks whether setting a custom default button in a property sheet works

[Alexandru Băluț]

The test I added checks that in a property sheet the custom default button
is pressed when the ENTER key is pressed and a different control, a
combobox, has the keyboard focus. The test succeeds when running on Vista,
and fails when running on Wine, that's why I added "todo_wine" before it.

This problem is described in bug 22862: "Setting the default button in a
PropertySheetPage does not work".
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