fix(node): start Layer before Budget.Supervisor

Budget.Advertiser advertises on init, which calls Hyper.Node.Layer.active/0
and selects on Hyper.Node.Layer.Registry. That registry is owned by
Hyper.Node.Layer, which was ordered after Budget.Supervisor - so boot crashed
with `unknown registry: Hyper.Node.Layer.Registry`. Order Layer first.

Author: markovejnovic

lib/hyper/node.ex

@@ -49,9 +49,12 @@ defmodule Hyper.Node do
   def init(_opts) do
     children = [
       Hyper.Node.Users,
+      # Layer owns Hyper.Node.Layer.Registry, which Budget.Advertiser queries
+      # (via Hyper.Node.Layer.active/0) as it advertises on init - so Layer must
+      # be up first.
+      Hyper.Node.Layer,
       Hyper.Node.Budget.Supervisor,
       {DynamicSupervisor, name: @vm_sup, strategy: :one_for_one},
-      Hyper.Node.Layer,
       Hyper.Node.Img
     ]