Support /dev/disk/by-id/ symlinks in command-line installer

[jakoblell]

Currently the command-line installer fails when giving the target device as a /dev/disk/by-id symlink (since it tries to access more information about the device in the /sys/ filesystem, for example /sys/class/block/${DISK#/dev/}/start). Many Linux users (including myself) prefer using these /dev/disk/by-id symlinks instead of raw device names (especially for dangerous operations such as formatting a device) since this reduces the probability of accidentally using an incorrect device.

This PR will resolve the symlink in the beginning of VentoyWorker.sh (directly when parsing the command-line arguments).

[ventoy]

DISK has been checked for -b above, so I think -L is better.

if [ -L "$DISK" ]; then
    DISK=$(readlink -e -n "$DISK")
fi

[jakoblell]

Thanks for the info, somehow used the incorrect test. Should be fixed now.