wintrust/tests: Fix build with MSVC. (try 2)

[Thomas Faber]

- Fixes empty braces used as initializers
- Works around FIELD_OFFSET(struct, array_member[index]) not being
  recognized as constant by MSVC

Try 2:
do not do the initialization at runtime, but instead rely on
FIELD_OFFSET(struct, array_member) still being constant
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