ports/filesystems: Fix fallout

A new filesystems category was created in the ports tree, with 142
filesystem related ports moved to there, some of them renamed.
Update all references in the src tree to the new locations.

PR: 283881
Fixes: ports:6e2da9672f79f44 (filesystems: add new category)
MFC after: 1 month
Reviewed by: fuz, mhorne, bapt
Accepted by: mhorne (mentor)
Differential Revision: https://reviews.freebsd.org/D48406

(cherry picked from commit 066ef2aec187ae93a9df01d25fa8e47d67ff972b)