Revert value label for the Qt Quick Controls Material slider

The SliderHandle was changed in 0ac8eb67ea
to display the current value of the slider, while the SliderHandle was
being pressed.

This feature should be optional, and we currently don't have a nice API
for hiding it.

Let's look for a way to introduce this feature in Qt 6.6 instead.

Task-number: QTBUG-111355
Pick-to: 6.5 6.5.0
Change-Id: I3c3f240839d1b69c0fea32d59c8abc8e64e1a184
Reviewed-by: Mitch Curtis <mitch.curtis@qt.io>

src/quickcontrols/material/impl/SliderHandle.qml

@@ -35,48 +35,4 @@ Item {
         active: root.handlePressed || root.handleHasFocus || (enabled && root.handleHovered)
         color: root.control ? root.control.Material.highlightedRippleColor : "transparent"
     }
-
-    Rectangle {
-        anchors.bottom: parent.top
-        anchors.bottomMargin: 6
-        anchors.horizontalCenter: parent.horizontalCenter
-        scale: root.handlePressed ? 1 : 0
-        implicitWidth: Math.max(tm.width + 8, height)
-        implicitHeight: tm.height + 8
-        radius: height / 2
-        color: root.control ? root.control.Material.accentColor : "transparent"
-        transformOrigin: Item.Bottom
-
-        Behavior on scale {
-            NumberAnimation {
-                duration: 100
-            }
-        }
-
-        Rectangle {
-            anchors.top: parent.bottom
-            anchors.horizontalCenter: parent.horizontalCenter
-            // Center the square to the parent circle, then position it downwards by half of the diagonal
-            anchors.topMargin: Math.floor(-parent.radius * 1.5 + Math.sqrt(parent.radius * parent.radius / 2))
-            implicitWidth: parent.radius
-            implicitHeight: parent.radius
-            rotation: 45
-            color: root.control ? root.control.Material.accentColor : "transparent"
-        }
-
-        TextMetrics {
-            id: tm
-            text: '8'.repeat(label.text.length)
-            font: label.font
-        }
-
-        Text {
-            id: label
-            anchors.centerIn: parent
-            text: Math.abs(Math.floor(value) - value.toFixed(2)) < Number.EPSILON ? Math.trunc(value) : value.toFixed(2)
-            color: root.control ? root.control.Material.primaryHighlightedTextColor : "transparent"
-            horizontalAlignment: Text.AlignHCenter
-            verticalAlignment: Text.AlignVCenter
-        }
-    }
 }