ctypedef: fix installation of C.UTF-8

The appropriate directory and name were assigned to the FILESDIR
grouping, but not the ALWAYS grouping where C.UTF-8 is actually
assigned. Add the appropriate bits for ALWAYSDIR, and remove an
obsolete *PACKAGE= assignment since C.UTF-8 is explicitly not included
in FILES.

Prior to this change, C.UTF-8 was being installed as
/usr/share/C.UTF-8.LC_CTYPE.

Reviewed by: manu
Fixes: 0fa5403d493b ("pkgbase: move locales into their own package")
Differential Revision: https://reviews.freebsd.org/D31429