too many arguments in rust protover_compute_vote()

569b4e57e23d728969a12751afc6b45f32d0f093 added an argument allow_long_proto_names: bool in order to maintain compatibility with consensus methods older than 29.

The C code never added this 3rd argument and only calls it with 2, which can't be safe.

Trac:
Username: cyberpunks