change map_lanetoxodr.fix a uturn bug.

src/tool/map_lanetoxodr/mainwindow.cpp

@@ -3806,9 +3806,9 @@ std::vector<geobase> MainWindow::CreateUTurnGeo(double startx, double starty, do
     else
     {
         c2.mfLen = (2.0*M_PI - hdgdiff) * R;
-        c2.mR = R;//R*(-1);
+        c2.mR = R*(-1);//R*(-1);
         c3.mfLen = c2.mfLen;
-        c3.mR = R;
+        c3.mR = R*(-1);
     }
     geobase l1,l2;
     if(fextend != 0)