[BUGFIX] Set maxLevels of generated sys_category TCA

The maxLevels in the TCA tree configuration is not set
by the CategoryRegistry. As a result only 4 levels are
shown.

This patch sets the maxLevels to 99 and also updates the
appearance settings of the sys_category:parent field
so these are inline with the other category tree fields.

Resolves: #57750
Releases: 6.2
Change-Id: I7c33b71d2af214cf1b2027e4769c1cc43a3c43d6
Reviewed-on: https://review.typo3.org/29297
Reviewed-by: Alexander Opitz
Reviewed-by: Francois Suter
Tested-by: Francois Suter
Reviewed-by: Stefan Neufeind
Reviewed-by: Fabien Udriot
Tested-by: Fabien Udriot
Reviewed-by: Frans Saris
Tested-by: Frans Saris