TuioTouch: Report empty touch areas for tokens

Currently TuioTouch plugin reports touch areas of size 1x1.
It's inconsistent with the platform plugins which report
empty touch areas when their size is unknown.

Change-Id: I253e4f7a95e8fb3ecc76c809a9be2afe3c976bef
Reviewed-by: Ariel Molina R <ariel@edis.mx>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

src/plugins/generic/tuiotouch/qtuiohandler.cpp

@@ -514,7 +514,6 @@ QWindowSystemInterface::TouchPoint QTuioHandler::tokenToTouchPoint(const QTuioTo
         tp.normalPosition = m_transform.map(tp.normalPosition);
 
     tp.state = tc.state();
-    tp.area = QRectF(0, 0, 1, 1);
 
     // We map the token position to the size of the window.
     QPointF relPos = QPointF(win->size().width() * tp.normalPosition.x(), win->size().height() * tp.normalPosition.y());