[BUGFIX] Stay on edited page after using "Save & Close"

"Save & Close" after editing a page now uses that edited
page (already highlighted in page tree) for returnUrl.

Resolves: #74180
Releases: master, 7.6
Change-Id: Icf2769263b2d428b86f339778f12b40759d94c13
Reviewed-on: https://review.typo3.org/47370


Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>