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ntdll: Fix incorrectly sized mov in user_mode_callback_return.

This caused non-interactible windows in my Wine builds, where in win32u dispatch_win_proc_params got inlined into call_window_proc and this mov overwrote the lower 32 bits of result, causing WM_NCHITTEST messages to always return 0 or 0xffffffff00000000 (correct result was -1 in that case).

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