qml: take exclusive grab for right button until release in `PlaybackSpeedButton.qml`

So that context menu is not opened in the player page.

modules/gui/qt/player/qml/controlbarcontrols/PlaybackSpeedButton.qml

@@ -103,6 +103,8 @@ PopupIconToolButton {
 
             enabled: root.popup.contentItem && root.popup.contentItem.slider
 
+            gesturePolicy: TapHandler.ReleaseWithinBounds
+
             onTapped: (eventPoint, button) => {
                 root.popup.contentItem.slider.value = 0
             }