VCS: Notify project wizard about config changes

... and have the project wizard update the available VCS.

Task-number: QTCREATORBUG-4423

src/plugins/mercurial/mercurialplugin.cpp

@@ -199,6 +199,7 @@ void MercurialPlugin::setSettings(const MercurialSettings &settings)
 {
     if (settings != mercurialSettings) {
         mercurialSettings = settings;
+        static_cast<MercurialControl *>(versionControl())->emitConfigurationChanged();
     }
 }