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wow64win: Fix UNICODE_STRING thunking in wow64_NtUserRegisterWindowMessage.

The function was passing a 32-bit UNICODE_STRING pointer directly to the 64-bit function, causing string corruption. Use the unicode_str_32to64() helper like other similar functions.

This fixes 32-bit .NET Framework applications failing to create windows, such as dnSpyEx v6.5.1 (x86), when using a new-style WoW64 build.

Fixes: 73f4aeb2

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