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

[zjqzero]

It's clearly stated in the documentation : https://www.ventoy.net/en/plugin_vtoyboot.html
For facilitate identification and processing, you MUST change the file suffix to .vtoy. This is mandatory.

So you can not set the name of the Linux vdisk as manjaro.vhd  you must set the name as manjaro.vhd.vtoy

For Ventoy,  .vhd file is always treated as Windows VHD file.
For Ventoy, only .vtoy file is treated as Linux vdisk file.

I have tried suffix (.vtoy), this issue reappeared again.

Usually I boot from Menu Extension Plugin,  and set VTOY_DEFAULT_IMAGE: "F6>Windows 10"

I specified boot method "vtoyboot_common_func" for manjaro.vhd,  so I think the file won't be treated as Windows VHD file.

It works perfectly until upgrading to Ventory 1.0.74.

```
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
}
```