[BUGFIX] Add icon rendering for custom permissions options

The icon rendering of custom page options was lost during
refactoring of the ItemProviders.

Resolves: #77075
Releases: master, 7.6
Change-Id: Iae6415525d94fc56c48332de9e5bc3980344fbc2
Reviewed-on: https://review.typo3.org/48967


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