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weston-init: fix display flickering

Mikhail Vanyulin requested to merge kirkstone-fix-display-flickering-in-weston into kirkstone

Refer to https://secogroup.atlassian.net/browse/YT-85 for full discussion on this topic.

For some unknown reason, when the transparency part of "background-color" parameter in weston.ini is lower than FF, display (both LVDS and HDMI) starts to constantly blink if some object/sprite is moving on display.

Herewith this issue cannot be seen if application is launched in full screen mode (e.g if seco-show-demo is running). But if seco-show-demo is stopped, the problem immediately appears when a mouse cursor or "weston-flower" are moved.

As digging into weston internals to understand what is going on will require reasonable efforts, we simply changed background-color to 0xFF000000, which also produces a black background, but which does not cause the blinking issue to appear.

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