xwayland: Use `double` for `xwl_tablet_tool`

Olivier Fourdan requested to merge ofourdan/xserver:libinput-issue-138 into master

So we do not lose subpixel precision in Xwayland.

Suggested-by: Peter Hutterer peter.hutterer@who-t.net Signed-off-by: Olivier Fourdan ofourdan@redhat.com Closes: libinput/libinput#138 (closed)

Edited by Olivier Fourdan

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