Fix Base SliderStyle handle to work with minimumValue != 0

Task-number: QTBUG-31622

Change-Id: I7a61f3ed806d66735bf86d1438b0fd61f904b9a6
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

src/styles/Base/SliderStyle.qml

@@ -177,7 +177,7 @@ Style {
                 id: handleLoader
                 sourceComponent: handle
                 anchors.verticalCenter: grooveLoader.verticalCenter
-                x: Math.round(control.__handlePos / control.maximumValue * ((horizontal ? root.width : root.height) - item.width))
+                x: Math.round((control.__handlePos - control.minimumValue) / (control.maximumValue - control.minimumValue) * ((horizontal ? root.width : root.height) - item.width))
             }
         }
     }