Fix Kimi K2 Thinking download by adding tiktoken.model to download patterns

[Drifter4242]

Kimi-K2 Thinking uses tiktoken.model for its tokenizer, which wasn't being downloaded. This adds it to the default_patterns alongside tokenizer.model. I'm a bit confused why this isn't a problem for other people - I know that others have used Kimi K2 (I wonder if they manually fixed the download).

Motivation

I downloaded Kimi K2 Thinking and it didn't work because it didn't download tiktoken.model file.

Changes

Added tiktoken.model to the default patterns.

Why It Works

Now downloads the file.

Test Plan

Manual Testing

I have two Macbook Studio M3 Ultras, each with 512Gb ram, connected with Thunderbolt 5. I ran Kimi K2 Thinking with MLX Ring and Tensor Split. It ran successfully.

Automated Testing

No automated test changes. I don't think they are needed.