Revert sense in VCLXAccessibleBox::getAccessibleActionCount again

...this had been switched from "m_bIsDropDownBox ? 1 : 0" to "m_bIsDropDownBox ?
0 : 1" in efb23f29983f87104a684e7fab00b84fc59d131d "Integrate branch of
IAccessible2" for no apparent reason and broke JunitTest_testtools_unoapi.

Change-Id: I276d2f452648387a5fa693349cf868787b2d48e1