message: refreshes loaded containers after saving new custom container
diff: @@ -3,7 +3,7 @@ import json
  import os
  from opentrons.containers.persisted_containers import get_persisted_container
  -from opentrons.containers.persisted_containers import list_container_names
  +from opentrons.containers import persisted_containers
  from opentrons.containers.placeable import (
  Deck,
  Slot,
  @@ -46,7 +46,7 @@ def load(container_name, slot, label=None):
  def list():
  - return list_container_names()
  + return persisted_containers.list_container_names()
  def create(slot, grid, spacing, diameter, depth, volume=0, name=None):
  @@ -100,3 +100,4 @@ def save_custom_container(data):
  f.seek(0)
  f.write(json.dumps(old_data, indent=4))
  f.truncate()
  + persisted_containers.load_all_persisted_containers_from_disk()
  