Start reading the default values in `NUMERIC`

[xaionaro]

Similarly to how ONE_OF was fixed in c0599ade83438ae4f050f6c2c169ee946e847f58, we also need to fix NUMERIC.

Otherwise we sometimes see something like this in hii list-questions:

    Question {
        name: "PXE boot wait time",
        answer: "Error: failed to fill whole buffer",
        options: [],
        help: "Wait time in seconds to press ESC key to abort the PXE boot. Use either +/- or numeric keys to set the value.",
    }