zsh: Use system ls bin in gcl()

It broke with `alias ls=lsd` because `lsd` doesn't detect that output is going to a pipe like `ls`.
`lsd`'s behavior is discussed in lsd-rs/lsd#1052.
This should let us avoid such further bugs.

zsh/.zshrc.d/functions.zsh

@@ -169,7 +169,7 @@ gcl () {
     if git clone --recursive "$@" ; then
         # cd into the last modified directory. This is simpler than trying to parse git arguments and
         # their order.
-        cd "$(ls -t | head -n1)"
+        cd "$(\ls -t | head -n1)"
     fi
 }