tmux: Disable tmux-sensible by Default

[gen740]

Description

In #5952, it was pointed out that tmux has changed how it handles shells, and because of this, the tmux.shell option doesn’t work properly unless tmux-sensible is turned off.

However, tmux-sensible hasn’t been updated for over two years, as mentioned here. Since it’s no longer actively maintained, keeping it enabled by default is becoming more of a problem.

This PR suggests turning off tmux-sensible by default to avoid these issues and improve usability.

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}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • Added myself as module maintainer. See example.

Maintainer CC

@rycee