fix(ls): fix missing ls command

Author: turboBasic

tests/ls.zunit

@@ -0,0 +1,16 @@
+#!/usr/bin/env zunit
+
+@setup {
+  typeset -gx HOME="$zi_test_dir"
+  typeset -gx ZBIN="$zi_test_dir/polaris/bin"
+}
+
+@test 'help' {
+  run zinit help
+  assert $state equals 0
+}
+
+@test 'ls' {
+  run zinit ls
+  assert $state equals 0
+}