Copilot suggestion not disappearing when turning off copilot

[N8th8n8el]

Check for existing issues

• [X] Completed

Describe the bug / provide steps to reproduce it

1. Start writing some code and trigger copilot to make a suggestion, but don't apply it
2. Turn off copilot => The suggestion never disappears, even after reenabling copilot.

https://github.com/zed-industries/zed/assets/19362696/c4c1590a-74f9-4820-9a51-e7fc94cd995c

Environment

Zed: v0.121.2 (Zed Preview) OS: macOS 14.2.1 Memory: 16 GiB Architecture: aarch64

If applicable, add mockups / screenshots to help explain present your vision of the feature

No response

If applicable, attach your ~/Library/Logs/Zed/Zed.log file to this issue.

If you only need the most recent lines, you can run the zed: open log command palette action to see the last 1000.

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