Support external platform assets #4
Description
The API currently returns 404 if the SteamGridDB entry has no user-uploaded cover. Many Steam games has "Original Steam Assets" that can be used instead, but the API currently ignores that.
For example: https://www.steamgriddb.com/game/5472785. You'll also often see this happening to new, niche or non-English games. For other examples, take the top entry from https://store.steampowered.com/explore/new and check the corresponding SteamGridDB entry.
The API to retrieve external assets is: https://www.steamgriddb.com/api/v2/games/id/{gameId}?platformdata=steam,flashpoint.
Example: https://www.steamgriddb.com/api/v2/games/id/5472785?platformdata=steam,flashpoint