[BUGFIX] Wrong SQL statements in TCA for sys_category

Copy and Paste problem. Table name
'tx_taxonomy_domain_model_concept' instead of
'sys_category'

Resolves: #44911
Releases: 6.0, 6.1
Change-Id: I92130a8dc5416b822edc71be148e35f193b5ea3b
Reviewed-on: https://review.typo3.org/18040
Reviewed-by: Wouter Wolters
Reviewed-by: Thomas Loeffler
Tested-by: Thomas Loeffler
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn