Include series/seriesnumber in viewgame API

[dfabulich]

An odd oversight. The putific API handles series/seriesnumber as inputs, but the viewgame API doesn't display them in the output.

[alice-blue]

I tested this by taking a look at viewgame?json&id=85jr6xdzreuac9e and it looks good to me:

"bibliographic": {
    "title": "The Impossible Stairs",
    "author": "Mathbrush",
    "language": "en",
    "firstpublished": "2022-07-01",
    "genre": "Fantasy, Surreal",
    "description": "Getting ready for a party can take a lot of time. Help CJ navigate a text adventure of temporal trials. \u003Cbr\u003E \u003Cbr\u003EMerciful puzzlefest. Parser or point-and-click, as you please. \u003Cbr\u003E \u003Cbr\u003EAuthorized sequel to The Impossible Bottle, by Linus Åkesson. The games are only loosely tied together, and can be played in either order or separately.",
    "series": "The Impossible Series",
    "seriesnumber": "2"