user32/tests: Fix WM_CHAR tests to use the input codepage.
User32 uses the input codepage in Unicode edit control. However, it uses ANSI codepage, i.e. CP_ACP, in ANSI version control.
Comctl32 is different from user32. It doesn't have A-W duality and uses the input codepage in it.
Edited by Akihiro Sagawa