show if the logged in user is a 'person with data'

this change means that if you log in as a member of a team but are not
a ‘pwd’ yourself you will only see the teams you are a member of

see issues https://github.com/tidepool-org/hub/issues/51, https://github.com/tidepool-org/hub/issues/52 and part of a resolution to this https://github.com/tidepool-org/hub/issues/50