Fix initialization of toolchain combobox in Qt4project

 * Initialize it to the toolchain used, not the preferred one

src/plugins/qt4projectmanager/qt4projectconfigwidget.cpp

@@ -417,7 +417,7 @@ void Qt4ProjectConfigWidget::updateToolChainCombo()
     foreach (ToolChain::ToolChainType toolchain, toolchains)
         m_ui->toolChainComboBox->addItem(ToolChain::toolChainName(toolchain), qVariantFromValue(toolchain));
     m_ui->toolChainComboBox->setEnabled(toolchains.size() > 1);
-    m_ui->toolChainComboBox->setCurrentIndex(toolchains.indexOf(m_buildConfiguration->qt4Target()->preferredToolChainType(toolchains)));
+    m_ui->toolChainComboBox->setCurrentIndex(toolchains.indexOf(m_buildConfiguration->toolChainType()));
     updateDetails();
 }