Strap doesn't work when using an ls alternative

This is included in my zshrc:
```
alias ls="exa"
```
Exa is a popular ls alternative and can be found here: https://github.com/ogham/exa
It does not support `-A`

This is what breaks in /etc/straprc:
```
if ([[ -n "${ZSH_VERSION}" ]] && setopt +o nomatch; ls -A "${HOME}"/.strap/etc/straprc.d/*.sh >/dev/null 2>&1); then
```