dix: force a minimum of 0 for screen coordinates.

Currently the root coordinates may fall into ]-1..0] if the subpixel
remainder is less than 0. Screen coordinates mustn't go below 0, so use
miPointerSetPosition to cap off the remainder if the coordinates are below
0.

This is cheating a bit, a more comprehensive solution to deal with subpixels
correctly when crossing screens is needed. For now, this'll do.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Simon Thum <simon.thum@gmx.de>

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