QGestureManager: port Q_FOREACH to ranged-for [5/6]

getGestureTargets() first parameter is a QSet created locally at the
call site in deliverEvents(); and the loop body doesn't change it.

Change-Id: I3484f7ecc9d85b22b45a123ccf75316d5316e031
Task-number: QTBUG-115803
Reviewed-by: Marc Mutz <marc.mutz@qt.io>

src/widgets/kernel/qgesturemanager.cpp

@@ -550,7 +550,7 @@ void QGestureManager::getGestureTargets(const QSet<QGesture*> &gestures,
     GestureByTypes gestureByTypes;
 
     // sort gestures by types
-    foreach (QGesture *gesture, gestures) {
+    for (QGesture *gesture : gestures) {
         QWidget *receiver = m_gestureTargets.value(gesture, nullptr);
         Q_ASSERT(receiver);
         if (receiver)