net/ucx: Fix VFS inotify watch on FreeBSD

IN_IGNORED is generated when a watch is removed and should not be
included in the inotify_add_watch request mask. FreeBSD rejects that
mask with EINVAL.

Remove the FreeBSD error workaround, which returned UCS_OK and caused
the VFS thread to retry in a tight loop.

PR: 296182
Reported by: thierry
Reviewed by: thierry (mentor),

Generic Rikka <rikka.goering@outlook.de> (maintainer)

Tested by: thierry (mentor),

Generic Rikka <rikka.goering@outlook.de> (maintainer)

Approved by: thierry (mentor)