Default assign tool bar and status bar width to parent

Change-Id: Icefa97a81427a682adedb643fa5c199f55594536
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

src/qtdesktop/StatusBar.qml

@@ -68,7 +68,7 @@ import QtDesktop.Private 1.0
 Item {
     id: statusbar
     implicitHeight: 20
-    implicitWidth: parent ? parent.width : 300
+    implicitWidth: parent ? parent.width : style.implicitWidth
     StyleItem {
         id: style
         anchors.fill: parent

src/qtdesktop/ToolBar.qml

@@ -73,7 +73,7 @@ Item {
     width: toolbar.width
     height: toolbar.height
     implicitHeight: toolbar.implicitHeight
-    implicitWidth: parent ? parent.width : 300
+    implicitWidth: parent ? parent.width : toolbar.implicitWidth
     Accessible.role: Accessible.ToolBar
     StyleItem {
         id: toolbar