QbsPM: Clear progress bar on project unload

Change-Id: I4f695a74032aa9f1e1b4d45f17ab8c4170717297
Reviewed-by: Christian Kandeler <christian.kandeler@digia.com>

src/plugins/qbsprojectmanager/qbsproject.cpp

@@ -136,6 +136,7 @@ QbsProject::~QbsProject()
     delete m_qbsProjectParser;
     if (m_qbsUpdateFutureInterface) {
         m_qbsUpdateFutureInterface->reportCanceled();
+        m_qbsUpdateFutureInterface->reportFinished();
         delete m_qbsUpdateFutureInterface;
         m_qbsUpdateFutureInterface = 0;
     }