Fixed file token URL consistency for non-expiring tokens

File tokens allow you to generate custom URLs for accessing files in Storage buckets.

We've fixed two issues with non-expiring file tokens:

• Unexpected expiration: Non-expiring tokens were incorrectly expiring after 15 minutes, despite being configured to never expire.
• Inconsistent URLs: Each request generated a different URL for the same non-expiring token, breaking caching and causing unnecessary revalidation.

With this fix:

• Non-expiring file tokens now generate consistent URLs across all requests.
• URLs remain valid indefinitely as intended.
• Improved reliability for long-term file sharing and caching strategies.

This update is now live on Appwrite Cloud.