allow vote to have 1 or 2 sigs (#20082)

perf/src/sigverify.rs

@@ -294,7 +294,9 @@ fn check_for_simple_vote_transaction(
     packet_offsets: &PacketOffsets,
     current_offset: usize,
 ) -> Result<(), PacketError> {
-    if packet_offsets.sig_len != 1 {
+    // vote could have 1 or 2 sigs; zero sig has already been excluded at
+    // do_get_packet_offsets.
+    if packet_offsets.sig_len > 2 {
         return Err(PacketError::InvalidSignatureLen);
     }