fix(fzf): fix zshIntegration

[cathaysia]

Description

fix fzf integration according to https://github.com/junegunn/fzf?tab=readme-ov-file#setting-up-shell-integration

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
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  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

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Maintainer CC

[cathaysia]

sorry, this is not a bug. It's my problem.