Call the new method to update units

If the units view is reopened after it has already been opened once,
call the newly created method to update the units table.

Fixes longturn#2399.

client/top_bar.cpp

@@ -617,6 +617,7 @@ void top_bar_units_view()
       return;
     }
     uv = reinterpret_cast<units_view *>(w);
+    uv->update_units();
     queen()->game_tab_widget->setCurrentWidget(uv);
   }
 }