gluon-mesh-batman-adv: List neighbors with non-best direct link

Links between two direct neighbors are not always the best route between
these devices. The flag BATADV_ATTR_FLAG_BEST would not be set for these
originator entries and the respondd module would just ignore this entry.

This causes missing links in meshviewer and similar tools. And when the
link quality is nearly equal and but fluctuates slightly, these links will
from time to time appear and disappear on the map.

Fixes: 2e0e24a9 ("announce neighbours using alfred/gluon-announce")