Show aliased fields for one voter if using alias 

Aliased fields are shown for voter listing ({HELIOS_HOST}/elections/<ELECTION_ID>/voters/), but not just for one voter ({HELIOS_HOST}/elections/<ELECTION_ID>/voters/<VOTER_ID>), when using alias.
Oh, you are completely right, there's no point in declaring `fields` like that, since as you told, alternate_fields are included in the for statement. So yes, it could be just 

`fields = self.FIELDS`

Sorry for the bad declaration! Thank you very much!