btrfs: fix printing of mount info messages for NODATACOW/NODATASUM

The NODATASUM message was printed twice by mistake and the NODATACOW was
missing from the 'unset' part.  Fix the duplication and make the output
look the same.

Fixes: eddb1a43 ("btrfs: add reconfigure callback for fs_context")
CC: stable@vger.kernel.org # 6.8+
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Kyoji Ogasawara <sawara04.o@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>