VCS: Update default value to current syntax

Change-Id: If640bacd36ad1d6bbffc91bc17a4320e1db34c6a
Reviewed-on: http://codereview.qt.nokia.com/264
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/plugins/vcsbase/vcsbaseeditorparameterwidget.cpp

@@ -55,7 +55,8 @@ class VCSBaseEditorParameterWidgetPrivate
 {
 public:
     VCSBaseEditorParameterWidgetPrivate() :
-        m_layout(0), m_comboBoxOptionTemplate(QLatin1String("%1=%2")) {}
+        m_layout(0), m_comboBoxOptionTemplate(QLatin1String("%{option}=%{value}"))
+    { }
 
     QStringList m_baseArguments;
     QHBoxLayout *m_layout;