Signed-off-by: Gabriel Ivăncescu <gabrielopcode@gmail.com>

WM_CHAR interprets the character codes using a code page tied to the
keyboard layout, not CP_ACP.
Also skip the test if WideCharToMultiByte() used the default character
since that breaks the round-trip.
Trace the code page when skipping the tests.

Wine-Bug: https://bugs.winehq.org//show_bug.cgi?id=54424

As in 6fd3bd9b.

In order to reduce wg_parser initialization time by skipping the round-trip to the PE thread.
Signed-off-by: Derek Lesho <dlesho@codeweavers.com>