twain_32/tests: Test with twaindsm.dll at 64-bits.
If I understand it right there is now no more a twain_32.dll at the 64-bit side. But currently the test still tries to load the function DSM_Entry from this dll. Therefore the 64-bit wine tests fail, as it uses a win_skip.
Therefore this patch makes the test use twain_32.dll with 32-bit and twaindsm.dll with 64-bit.
What do you think?
Followup to c7570143.