Add the helm vars for configuring whether emails of team members are visible.

[ChrisPenner]

To enable this feature you need a custom brig image and a configuration override:
Add the following override to your values.yaml for your wire-server chart

brig:
  image:
    tag: 0.0.1-pr.1229
  config:
    optMutableSettings:
      setEmailVisibility: visible_if_on_team