tests W32: Fix Windows values casting
tests W32: Fix Windows values casting

LPARAM is LONG_PTR which is the same as INT_PTR on Windows.
WPARAM is UINT_PTR.
HWND is a pointer.
(%p prints pointers without 0x prefix, hence the extra 0x).

endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib,endlessm/glib