Disable "sibling" lines

[KHV8]

Hi Samantha, Zigzag is much better than the build in map, thanks.

Inspired by Zigbee2MQTT maps, the possibility to "not show siblings" give a good overview of the routing in the zigbee mesh. Have helped me solving connection problems with routing in my basement (I use Zigbee2MQTT as a test down there).

Not sure if it would be easy to draw the map without the sibling connections. If easy, it would be a very nice feature for debugging bad connections.