[BUGFIX] Use `Storage/Persistent` in page tree

There is a left over usage of `top.TYPO3.Storage` in the ExtJS based
page tree. This usage is replaced with the `Storage/Persistent` module.

Resolves: #83050
Related: #82603
Releases: master
Change-Id: I68a33d257599f316eb8e169121ec8408397748e8
Reviewed-on: https://review.typo3.org/54705


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Frank Naegler <frank.naegler@typo3.org>
Tested-by: Frank Naegler <frank.naegler@typo3.org>