fix: usr: Fix a bug in allow-query/allow-transfer catalog zone custom properties

The :iscman:`named` process could terminate unexpectedly when
processing a catalog zone with an invalid ``allow-query`` or
``allow-transfer`` custom property (i.e. having a non-APL type)
coexisting with the valid property. This has been fixed.

Closes #5941

Merge branch '5941-catz-catz_process_apl-bug-fix' into 'main'

See merge request isc-projects/bind9!11954