PATH is parsed incorrectly when using fish with vi keybindings

[arrangabriel]

Version 0.1.0-0ff78f1 of expert fails to start, with this error log:

Couldn't find an elixir executable for project at <project root>. Using shell at /opt/homebrew/bin/fish with PATH=\27[2 q

The PATH only contains an escape sequence, so obviosuly no elixir executable is found, even though I have it installed and in my PATH.

Looking at the code, this line is to blame. As the output looks like:

iex> System.cmd("/opt/homebrew/bin/fish", ["-i", "-l", "-c", "echo $PATH"])
{"\e[6 q/<space separated path entries>\n\e[2 q", 0}

Removing the -i flag results in the more reasonable:

iex> System.cmd("/opt/homebrew/bin/fish", ["-i", "-l", "-c", "echo $PATH"])
{"<space separated path entries>\n", 0}

The escape characters are inserted by the following lines in my fish config

if status is-interactive
    fish_vi_key_bindings
end

---

I'm not sure if just removing the flag is the best solution, or if something more robust is required.