[com_fields] Change key to name as for lists

[laoneo]

Pull Request for Issue #12673.

Summary of Changes

Changes the key of the list options to the structure needed by the list.

Testing Instructions

• Create a radio or checkbox field for Articles with some options.
• Create an article.
• Open the fields tab.

Expected result

The checkboxes or radio button should be shown.

[ggppdk]

I have tested this item ✅ successfully on 772fbdc

Please merge this, because fields checkboxes and radio do not show, the PHP code expects "name" and not "key"

this change is included in this PR too: #12739

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/12698.}

[jeckodevelopment]

I have tested this item ✅ successfully on 772fbdc

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/12698.}

[jeckodevelopment]

RTC

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/12698.}