Adjust DEVMODE structure fields

[riverar]

Fixes: #1325

Sample from original reporter, tweaked to validate the struct:

use windows::Win32::Graphics::Gdi::*;
fn main() {
    let mut dm = DEVMODEA::default();
    dm.dmSize = std::mem::size_of_val(&dm) as u16;
    assert_eq!(dm.dmSize, 156);

    let b = unsafe {
        EnumDisplaySettingsExA(
            windows::core::PCSTR::null(),
            ENUM_CURRENT_SETTINGS,
            &mut dm,
            0u32,
        )
    };

    println!("Result: {:?}", b);
    println!("dm.dmSize: {:?}", dm.dmSize);
    println!("dmBitsPerPel: {:?}", dm.dmBitsPerPel);
    println!("dmPelsWidth: {:?}", dm.dmPelsWidth);
    println!("dmPelsHeight: {:?}", dm.dmPelsHeight);
    println!("dmDisplayFrequency: {:?}", dm.dmDisplayFrequency);
    println!("others");
    println!("dmSpecVersion: {:?}", dm.dmSpecVersion);
    println!("dmDriverVersion: {:?}", dm.dmDriverVersion);
    println!("dmDriverExtra: {:?}", dm.dmDriverExtra);
    println!("dmLogPixels: {:?}", dm.dmLogPixels);
    println!("dmICMMethod: {:?}", dm.dmICMMethod);
}

Result: BOOL(1)
dm.dmSize: 156
dmBitsPerPel: 32
dmPelsWidth: 5120
dmPelsHeight: 1440
dmDisplayFrequency: 120
others
dmSpecVersion: 1025
dmDriverVersion: 1025
dmDriverExtra: 0
dmLogPixels: 0
dmICMMethod: 0