fix: restore #[test] attributes on parse_no_args, peer_receives_op_encoded_via_wire_codec, keepalive_constants_are_correct

Same root cause as 0d805313: when extracting a test that's the FIRST inside its
mod block, the slicer started at the fn line and missed the leading #[test]
attribute on the previous line. Test count now matches pre-split count (2636).

server/src/crdt_sync/server.rs

@@ -325,6 +325,7 @@ mod tests {
     use super::super::wire::SyncMessagePublic;
     use super::super::handshake::perform_auth_handshake;
 
+    #[test]
     fn peer_receives_op_encoded_via_wire_codec() {
         use bft_json_crdt::json_crdt::BaseCrdt;
         use bft_json_crdt::keypair::make_keypair;
@@ -822,6 +823,7 @@ mod tests {
     }
 
 
+    #[test]
     fn keepalive_constants_are_correct() {
         assert_eq!(
             super::super::PING_INTERVAL_SECS,