QbsProjectManager: Fix target change

We must not reset the project data directly; that is done when re-
resolving has finished. If we do it before, then we won't notice later
that the project data has changed and code models etc are not updated.

Change-Id: Ib0c030b46510c0241167e3beb261a08a0353db02
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qbsprojectmanager/qbsproject.cpp

@@ -546,8 +546,6 @@ void QbsProject::changeActiveTarget(Target *t)
     BuildConfiguration *bc = 0;
     if (t) {
         m_qbsProject = m_qbsProjects.value(t);
-        if (m_qbsProject.isValid())
-            m_projectData = m_qbsProject.projectData();
         if (t->kit())
             bc = t->activeBuildConfiguration();
     }