According to Wikipedia, "the distinction is that electrical engineers are usually concerned with using electricity to transmit energy, while electronics engineers are concerned with using electricity to transmit information". In the case of heated rollers, straighteners, etc., it is the transmission of energy (heat) that's important, so "electrical" is probably a better term. Of course, most modern appliances now have electronic (maybe even computerised) control systems, even if only for the maintenance of correct temperature, so I don't think you were actually wrong in what you wrote - just that perhaps in this context "electrical" is probably more appropriate.