QMakeProjectManager: Introduce member initialization.

Change-Id: I69df0c22a215b2df12f63fdc47082e9797fc02ac
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>

src/plugins/qmakeprojectmanager/externaleditors.cpp

@@ -210,8 +210,7 @@ DesignerExternalEditor::DesignerExternalEditor(QObject *parent) :
     ExternalQtEditor(designerIdC,
                      QLatin1String(designerDisplayName),
                      QLatin1String(Designer::Constants::FORM_MIMETYPE),
-                     parent),
-    m_terminationMapper(0)
+                     parent)
 {
 }