--fix mangles tasks using "=" formatting

[tremble]

Summary

if a task uses the old some_key= format ansible-lint --fix mangles it

Issue Type

• Bug Report

OS / ENVIRONMENT

ansible-lint 6.22.1 using ansible-core:2.17.0.dev0 ansible-compat:4.1.10 ruamel-yaml:0.18.5 ruamel-yaml-clib:0.2.8

• ansible installation method: source
• ansible-lint installation method: pip

STEPS TO REPRODUCE

running ansible-lint --fix against the example YAML results in a junk return value:

- name: example playbook
  hosts: localhost
  tasks:
    - debug: msg='Hello there world'

Desired Behavior

---
- name: Example playbook
  hosts: localhost
  tasks:
    - ansible.builtin.debug:
        msg: "Hello there world"

Actual Behavior

---
- name: Example playbook
  hosts: localhost
  tasks:
    - ansible.builtin.debug:
        msg: "'Hello"
        cmd: there world'