Weston 8: kiosk-shell background is black but should be grey

[Terry Barnaby]

From what I can see the kiosk-shell in Weston 9.0 should draw a grey 
(0.5, 0.5, 0.5) solid colour background. However on my NXP embedded 
system it shows as black.

Should the kiosk-shell in Weston 9.0 actually draw grey ?
If so is there some configuration I'm missing or is there a bug with 
that release ?

Terry