ENYO-1996: fix long-standing `ServiceRegistry` bug

- `kind: enyo.Component` instantiates an `enyo.Control`, while
  `kind: "enyo.Component" correctly instantiates an `enyo.Component`

Enyo-DCO-1.1-Signed-off-by: Francois-Xavier KOWALSKI <francois-xavier.kowalski@hp.com>