chinese/rime-cantonese: Change LICENSE_PERMS_ODbL

ODbL licensed files can be distributed freely over Internet or
physically for no more than reasonable production cost.

Since ODbL has been integrated into Mk/bsd.licenses.db.mk, the change is
implemented by switching over to the integrated entry.

Sponsored by: The FreeBSD Foundation
Approved by: lwhsu (ports)
Differential Revision: https://reviews.freebsd.org/D30089