plugin XEP-0346: use submitted namespace for node: the node was not always adapted to the submitted namespace now used with XEP-0346, this patch fixes it by adding the prefix when it's missing.

version: "3.6"
services:

  sat:
    image: salutatoi/sat
    build: backend

  libervia:
    image: salutatoi/libervia
    build: libervia
    depends_on:
      - sat