types: fix recurrence rule types

[vladfrangu]

Please describe the changes this PR makes and why it should be merged:

Fixes types for recurrence rule being wrong, thanks to a report from @favna

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

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[favna]

Tested with the following code:

await guild.scheduledEvents.create({
  name: eventData.name,
  entityType: GuildScheduledEventEntityType.External,
  entityMetadata: { location: "FC House" },
  privacyLevel: GuildScheduledEventPrivacyLevel.GuildOnly,
  scheduledStartTime: eventData.instance.dateTime,
  scheduledEndTime: addHours(eventData.instance.dateTime, eventData.duration),
  description: eventData.description ?? undefined,
  reason: `Event created by ${leaderUser.user.username}`,

  ...(eventData.interval &&
  (eventData.interval === $Enums.EventInterval.WEEKLY ||
    eventData.interval === $Enums.EventInterval.ONCE_EVERY_OTHER_WEEK)
    ? {
        recurrenceRule: {
          startAt: eventData.instance.dateTime.toISOString(),
          frequency: GuildScheduledEventRecurrenceRuleFrequency.Weekly,
          interval: eventData.interval === $Enums.EventInterval.WEEKLY ? 1 : 2,
          byWeekday: [getISODay(eventData.instance.dateTime) - 1],
          endAt: addHours(eventData.instance.dateTime, eventData.duration),
        },
      }
    : {}),
});