remove redundant remote_user for local setting

[bcoca]

local action plugin already does and this also should fix
fork/thread issue by removing use of pwd library

fixes #59642

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

play_context

[felixfontein]

This PR breaks the following playbook (t.yml) for me:

- hosts: remote_server
  tasks:
  - copy:
      src: t.yml
      dest: /tmp/t.yml
    delegate_to: localhost

It does not break when hosts: localhost.

[felixfontein]

fatal: [remote-server]: UNREACHABLE! => {"changed": false, "msg": "Failed to create temporary directory.In some cases, you may have been able to authenticate and did not have permissions on the target directory. Consider changing the remote tmp path in ansible.cfg to a path rooted in \"/tmp\", for more error information use -vvv. Failed command was: ( umask 77 && mkdir -p \"` echo /root/.ansible/tmp `\"&& mkdir \"` echo /root/.ansible/tmp/ansible-tmp-1604856819.0247443-194052-180695334418942 `\" && echo ansible-tmp-1604856819.0247443-194052-180695334418942=\"` echo /root/.ansible/tmp/ansible-tmp-1604856819.0247443-194052-180695334418942 `\" ), exited with result 1", "unreachable": true}

[bcoca]

I cannot reproduce with that play.

[felixfontein]

Looks like this only happens (for me) if the remote user is root, while I run the playbook as a regular user.