no_voter_precincts do not include the PCT area ID prefix

[carl3]

The IDs for precincts are area IDs of the form PCTnnnn, and use the PCT prefix. This prefix could be stripped when printing. The election.no_voter_precincts is a list of precinct IDs without the PCT prefix. These should probably be converted to IDs with the prefix, consistent with the contest.no_voter_precincts.

The no_voter_precincts list could be converted into pointers to the precinct area object.

Also, the name and short name need some fixes, e.g.
"name": "Precinct 1151 MB",
"short_name": "Precinct 1151 MB",

The short name should just be the precinct number, and MB should be removed from the name since it's redundant with is_vbm.