vnc: Fix artifacts in hextile decoding
02c2b87f introduced a regression whereas the foreground color in a hextile update was not being properly invalidated leading to artifacts. It's still necessary to explicitly invalidate the foreground color with a SubrectColoured tile even though we no longer send a foreground color as part of the tile. Reported-by: NMark Cave-Ayland <mark.cave-ayland@siriusit.co.uk> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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