Core/RBAC: Fix rare NULL dereference

Fix a rare NULL dereference happening if 'rbac_default_permissions' table has secId "255" as first row.
Core/World: Remove unused code

Remove unused code added in f20b25d1c90f608deab28c9957b3b376ab2a0d50
DB/SAI: More EAI to SAI conversions.
DB/SAI: more EAI to SAI updates.