Strip option text

[azmeuk]

When <option> tags are indented in HTML output, the inner text technically contains carriage returns and space characters.

Test assertions generally want to ignore those spaces, and check the actual text.

<select name="select">
    <option>
        foobar
    </option>
</select>

Without this patch, form["select"].options value would be \n foobar\n , with the patch it is simply foobar.