update witnesses page to use new api calls
witness info has been removed from get_state, so update the wallet page to use the new api calls for getting witness info.
I see plenty of witness related API calls. In database_api we have list_witnesses, find_witnesses, list_witness_votes, get_active_witnesses, get_witness_schedule In condenser_api get_active_witnesses, get_witness_schedule, get_witnesses, get_witness_by_account, get_witnesses_by_vote, lookup_witness_accounts, get_witness_count (most reuse database_api functionality in one way or the other) old get_state used get_witnesses_by_vote