libcephfs_proxy: remove unnecessary protocol references in daemon

libcephfs_proxy: remove unnecessary protocol references in daemon

With the new protocol structure definitions, it's not necessary to
explicitly access each field inside its version substructure (v0, for
example). Now all fields of the latest version are declared inside an
anonymous substructure that can be accessed without a prefix.

Fixes: https://tracker.ceph.com/issues/72800
Signed-off-by: Xavi Hernandez <xhernandez@gmail.com>
(cherry picked from commit b5df01a605d0adfa332e08665faea00bf7b0fbd0)