Fix to ctor_nonadapt, so that calls such as u = chebfun(cos(x),100) don't throw away AD information (AD was not working with such calls before).
Fix to ctor_nonadapt, so that calls such as u = chebfun(cos(x),100) don't throw away AD information (AD was not working with such calls before).

nickhale/chebfunV4,chebfun/chebfun_v4