Revert "[stable-2.7] Handle sets differently than lists in wrap_var. Fixes #47372."

This reverts commit 0e933f76ba4edb0e06f0779f5fb4b0ea85191e8b.

The tests for this were broken on centos6 because jinja2 does not have
a map filter on that platform.  Tests need to be rewritten

test/integration/targets/loops/tasks/main.yml

@@ -258,13 +258,3 @@
   loop: []
   register: literal_empty_list
   failed_when: literal_empty_list is not skipped
-
-# https://github.com/ansible/ansible/issues/47372
-- name: Loop unsafe list
-  debug:
-    var: item
-  with_items: "{{ things|map('string')|unique }}"
-  vars:
-    things:
-      - !unsafe foo
-      - !unsafe bar