Stop validators from equivocating on reboot

Part of https://github.com/serai-dex/serai/issues/345.

The lack of full DB persistence does mean enough nodes rebooting at the same
time may cause a halt. This will prevent slashes.

coordinator/tributary/src/lib.rs

@@ -218,7 +218,7 @@ impl<D: Db, T: TransactionTrait, P: P2p> Tributary<D, T, P> {
       TendermintNetwork { genesis, signer, validators, blockchain, to_rebroadcast, p2p };
 
     let TendermintHandle { synced_block, synced_block_result, messages, machine } =
-      TendermintMachine::new(network.clone(), block_number, start_time, proposal).await;
+      TendermintMachine::new(db.clone(), network.clone(), block_number, start_time, proposal).await;
     tokio::spawn(machine.run());
 
     Some(Self {

coordinator/tributary/src/tendermint/mod.rs

@@ -302,6 +302,8 @@ fn assert_target_block_time() {
 
 #[async_trait]
 impl<D: Db, T: TransactionTrait, P: P2p> Network for TendermintNetwork<D, T, P> {
+  type Db = D;
+
   type ValidatorId = [u8; 32];
   type SignatureScheme = Arc<Validators>;
   type Weights = Arc<Validators>;