QmlProfiler: Make sure timeChanged() signal is queued when needed

It can be triggered from a thread loading trace data. This triggered
the warnings about QObject::startTimer and QObject::killTimer and was
generelly unsafe.

Change-Id: Iee1f5f29a49147a20b1f5c826f85b6713fcb8a45
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

src/plugins/qmlprofiler/qmlprofilertraceview.cpp

@@ -97,7 +97,7 @@ QmlProfilerTraceView::QmlProfilerTraceView(QWidget *parent, QmlProfilerTool *pro
 
     d->m_zoomControl = new Timeline::TimelineZoomControl(this);
     connect(modelManager->traceTime(), &QmlProfilerTraceTime::timeChanged,
-            [this](qint64 start, qint64 end) {
+            this, [this](qint64 start, qint64 end) {
         d->m_zoomControl->setTrace(start, end);
         d->m_zoomControl->setRange(start, start + (end - start) / 10);
     });