If you insert a content element (or a page) at a concrete position
f.e. after content element 15 the value in ['pid'] is -15.

But in ->data we already have the real pid, so we can just use it.

This reverts commit e8677321.

Fixes: https://forge.typo3.org/issues/65150

Fixes: #61163

This means:
- load files with the page renderer
- fix missing RTE in inline elements