Set the default-command for tmux
Set the default-command for tmux

This prevents tmux from starting a login shell, which would read
/etc/profile, which uses `/usr/libexec/path_helper -s` to generate a
path. It's not the one we want. Just give me a regular shell.

benknoble/Dotfiles,benknoble/Dotfiles,benknoble/Dotfiles,benknoble/Dotfiles,benknoble/Dotfiles