[BUGFIX] Use correct object to build "copy" payload

The method `sendChangeCommand()` now builds a proper payload by
pushing data into `params.data.copy` prior to the non-exisiting
`data.copy` array.

Resolves: #99726
Releases: main, 11.5
Change-Id: I96f279cb2f5eedc4a6658f89f0975c8a14bd42c1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77612


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>