[BUGFIX] Fix editing a FileStorage from FileTree on PostgreSQL

Avoid a SQL error on PostgreSQL when editing a FileStorage from FileTree
by passing the UID instead of a combined identifier like '1:/' to
EditDocumentController. Additionally fix the possibility for an SQL
error in BackendUtility::getRecord() by casting the UID.

Releases: master, 8.7
Resolves: #82799
Change-Id: I5cfde8b53767da1166ebd5f778e36ca85825a173
Reviewed-on: https://review.typo3.org/54436


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>