[ISSUE] Ventory 1.0.74 legacy boot linux vdisk(vhd) lead to black screen

[zjqzero]

Ventory 1.0.74 legacy boot linux vdisk(vhd) lead to black screen.  but win10 vdisk(vhd) boot success.

So I rollback to 1.0.73 boot success both win10 and linux.

[ventoy_grub.cfg]

```
menuentry "Windows 10" --class=windows {   
    set vdisk_path="/Images/Win10.vhd"
    if search -n -s vdiskhd -f "$vdisk_path"; then
        vhdboot_common_func "($vdiskhd)$vdisk_path"
    else
        echo "$vdisk_path not found"
    fi
}

menuentry "Manjaro" --class=manjaro {   
    set vdisk_path="/Images/manjaro.vhd"
    if search -n -s vdiskhd -f "$vdisk_path"; then
        vtoyboot_common_func "($vdiskhd)$vdisk_path"
    else
        echo "$vdisk_path not found"
    fi
}
```