display-channel: Remove extra 'the' in comment
display-channel: Remove extra 'the' in comment

Fixes `make syntax-check`

https://gitlab.com/spice/spice/builds/14346626

Acked-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>

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