projectexplorer: fix writing of project settings.

This was broken after 503c6e26.

Task-number: QTCREATORBUG-6989
Change-Id: I4419c7efb541e7a2f6d089c279d66c9a52baf46b
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/projectexplorer/runconfiguration.cpp

@@ -368,7 +368,9 @@ Target *RunConfiguration::target() const
 
 QVariantMap RunConfiguration::toMap() const
 {
-    QVariantMap map = m_debuggerAspect->toMap();
+    QVariantMap map = ProjectConfiguration::toMap();
+
+    map.unite(m_debuggerAspect->toMap());
 
     foreach (IRunConfigurationAspect *aspect, m_aspects)
         map.unite(aspect->toMap());