Revert "Unconditionally update routes going through a neighbour on IHU."
Revert "Unconditionally update routes going through a neighbour on IHU."

This reverts commit 4229bea0c2ece00985894ddcf056e302dfb05943.

dtaht/babeld-shortrtt-metrics,woniullb/babeld,jech/babeld,wlanslovenija/babeld,sudomesh/babeld,jech/babeld,Drooids/babeld,Gwendocg/babeldToS,tcatm/babeld,boutier/babeld,Gwendocg/babeldToS,wlanslovenija/babeld