comdlg32: fix building the tests with MSVC headers

[Reece Dunn]

The Microsoft commdlg.h header (not sure which versions of the SDK
this affects) guards LPPRINTDLGEXW inside a "#ifdef STDMETHOD" guard,
even though this is only needed for IPrintDialogCallback and
IPrintDialogServices. Therefore, to get the comdlg32 tests to compile
properly using those headers, objbase.h is required.

- Reece
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