smartcard: fix PIPE_ITEMs enum indexing
smartcard: fix PIPE_ITEMs enum indexing

The enum should start from PIPE_ITEM_TYPE_CHANNEL_BASE, otherwise,
PIPE_ITEM_TYPE_ERROR is handled like PIPE_ITEM_TYPE_SET_ACK.

alon/spice-server,alon/spice-server,Fantu/spice,Fantu/spice,alon/spice-server,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,elmarco/spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,SPICE/spice,fgouget/spice,freedesktop-unofficial-mirror/spice__spice,alon/spice-server,freedesktop-unofficial-mirror/spice__spice,freedesktop-unofficial-mirror/spice__spice,mathslinux/spice,SPICE/spice,alon/spice-server,elmarco/spice,mathslinux/spice,mathslinux/spice,ya-mouse/spice,elmarco/spice,elmarco/spice,fgouget/spice,SPICE/spice,ya-mouse/spice,fgouget/spice,ya-mouse/spice,mathslinux/spice,Fantu/spice,elmarco/spice,Fantu/spice