Fix Breakpoint storing in session

Task-number: QTCREATORBUG-9253

Change-Id: Idf517286394796e516115009789e6ff7df527c91
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/debugger/debuggerplugin.cpp

@@ -2478,7 +2478,6 @@ void DebuggerPluginPrivate::sessionLoaded()
 
 void DebuggerPluginPrivate::aboutToUnloadSession()
 {
-    m_breakHandler->removeSessionData();
     m_toolTipManager->sessionAboutToChange();
 }