Presently we base the default long name (Meshtastic XXXX) and short
names (XXXX) on a node's MAC address. This works fine, unless you
have a node with no bluetooth, like Portduino.
Our logic for node numbers is also based on MAC address. However,
it has the added feature that it will create a random node number
if the Mac address is no good. The name is always "Meshtastic 0001".
This change switches node names (long and short) to instead rely
on the node number for defaults. For nodes with mac addresses,
there should be no user-visible change. For nodes without, they'll
now have a name other than "Meshtastic 0001".
Fixes https://github.com/meshtastic/firmware/issues/5370
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
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