Fix core-interface type regression
Fix core-interface type regression

This was introduced with 96e94c6f32d4345ea25ef7a474fbd92de03b38ad
(Convert RedChannel hierarchy to GObject).
The type for "core-interface" property should be
SpiceCoreInterfaceInternal, not SpiceCoreInterface.

Signed-off-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>
Acked-by: Christophe Fergeau <05b95054a663c388a4e33d95828cb30f0370f8ef@redhat.com>

fgouget/spice,fgouget/spice,fgouget/spice,fgouget/spice