types(Interaction): Narrow memberPermissions

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
Narrowing this type as it is present from guilds.

Note: Prettier modified the file elsewhere.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

[vladfrangu]

Won't this make it return null for non cached guilds?

[Jiralite]

Won't this make it return null for non cached guilds?

The RawType (from a guild, specifically raw) and PresentType (from a guild) defaults to the CachedType (from a guild, specifically cached) in this case, so no:

export type CacheTypeReducer<
  State extends CacheType,
  CachedType,
  RawType = CachedType,
  PresentType = CachedType | RawType,
  Fallback = PresentType | null,
> = [State] extends ['cached']
  ? CachedType
  : [State] extends ['raw']
  ? RawType
  : [State] extends ['present']
  ? PresentType
  : Fallback;

The only time it will be null is in the fallback where no guild checks are done as it is not possible to receive this from a direct message.