QmlProfiler: Properly align time labels and bars

Due to QTBUG-34962 we can't rely on the width properties of Flickables
so we use some other elements to size the background bars.

Task-number: QTCREATORBUG-10882
Change-Id: Iee427022111b6092486adaebfd33f8e2e6a91190
Reviewed-by: Kai Koehne <kai.koehne@digia.com>

src/plugins/qmlprofiler/qml/MainView.qml

@@ -317,7 +317,7 @@ Rectangle {
             id: backgroundMarks
             y: vertflick.contentY
             height: vertflick.height
-            anchors.right: parent.right
+            width: root.width - labels.width
             anchors.left: labels.right
         }