Fix ToolBar size

We should not override the implicit size.

Change-Id: I12b8639c527e6c2170507c3ce36605ae1d839b90
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

src/controls/ToolBar.qml

@@ -69,8 +69,6 @@ import QtQuick.Controls.Private 1.0
 */
 
 Item {
-    width: toolbar.width
-    height: toolbar.height
     implicitHeight: toolbar.implicitHeight
     implicitWidth: parent ? parent.width : toolbar.implicitWidth
     Accessible.role: Accessible.ToolBar