oleaut32: Fix copy and paste error in VARIANT_UserUnmarshall with VT_UNKNOWN test.

[Robert Shearman]

The variant type is VT_UNKNOWN so we should be using V_UNKNOWN, not 
V_VARIANTREF(V_R8) to check the type unmarshalled properly.
---
  dlls/oleaut32/tests/usrmarshal.c |    4 +---
  1 files changed, 1 insertions(+), 3 deletions(-)
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