wined3d: Use BOOL type where appropriate

[Henri Verbeet]

On 11 October 2013 22:51, Frédéric Delanoy <frederic.delanoy at gmail.com> wrote:
> -    DWORD onesided_enable = FALSE;
> -    DWORD twosided_enable = FALSE;
> +    DWORD onesided_enable = 0;
> +    DWORD twosided_enable = 0;
Actually, all of those initializations are redundant.