StationEditDialog: refresh row count on connection import

When importing track connections from SVG, recalculate model row count,
so the view gets update automatically.

src/stations/manager/stations/dialogs/stationeditdialog.cpp

@@ -741,6 +741,8 @@ void StationEditDialog::importConnFromSVG()
                              tr("Generic error"));
 
     }
+
+    trackConnModel->refreshData(); //Recalc row count
 }
 
 void StationEditDialog::saveXmlPlan()