QmlProfiler: avoid reference to connection in UI

The reference to the "connection" instance can become a dangling pointer.

Change-Id: Icde6fed39d19f35420904f718d12931d297d1511
Reviewed-on: http://codereview.qt.nokia.com/1934
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Kai Koehne <kai.koehne@nokia.com>

src/plugins/qmlprofiler/qml/MainView.qml

@@ -173,6 +173,7 @@ Rectangle {
     property real elapsedTime;
     signal updateTimer;
     Timer {
+        id: elapsedTimer
         property date startDate
         property bool reset:  true
         running: connection.recording