fix(GuildMemberManager): Ensure empty object for fetching many guild members

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
A regression from #10715: when doing fetch(), an error is thrown:

/Users/jiralite/Documents/GitHub/discord.js/discord.js/packages/discord.js/src/managers/GuildMemberManager.js:220
    limit = 0,
    ^

TypeError: Cannot read properties of undefined (reading 'limit')
    at GuildMemberManager._fetchMany (/Users/jiralite/Documents/GitHub/discord.js/discord.js/packages/discord.js/src/managers/GuildMemberManager.js:220:5)
    at GuildMemberManager.fetch (/Users/jiralite/Documents/GitHub/discord.js/discord.js/packages/discord.js/src/managers/GuildMemberManager.js:201:31)
    at Client.<anonymous> (/Users/jiralite/Documents/GitHub/Soulobby/Soulobby/source/test.ts:11:58)
    at Client.emit (/Users/jiralite/Documents/GitHub/discord.js/discord.js/node_modules/.pnpm/@[email protected]/node_modules/@vladfrangu/async_event_emitter/src/index.ts:513:28)
    at Client._triggerClientReady (/Users/jiralite/Documents/GitHub/discord.js/discord.js/packages/discord.js/src/client/Client.js:389:10)
    at Client._checkReady (/Users/jiralite/Documents/GitHub/discord.js/discord.js/packages/discord.js/src/client/Client.js:283:12)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)

This is because the empty object default was removed, and as such, properties were attempted to be extracted from undefined.

This pull request adds the empty object back in.

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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2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
discord-js	⬜️ Ignored (Inspect)			Mar 7, 2025 10:19am
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