Try fix repeatedly getting a new NodeNum

[GUVWAF]

We're comparing ourMacAddr to user.macaddr in pickNewNodeNum(), but owner.macaddr might not yet be set when we copy it to the info of our node in the DB here:

firmware/src/mesh/NodeDB.cpp

Line 167 in 68d6ff8

info->user = TypeConversions::ConvertToUserLite(owner);