VRRP: Remove a few remaining old truncation props.

VRRP: Remove a few remaining old truncation props.

Remove the only remaining ND_TCHECK_1() and let the string printing
function guard the snapshot end. While at it, switch the latter to the
one that handles zero padding properly. This makes no difference in the
existing VRRP test, which uses a maximum length password. Lose the
trailing quote so the truncation label justly appears within the
authentication field, not after it.