Change max synced age ms to use block time

This was originally meant to be 4x block time, but since we changed the
block time, this is out of sync. Were also making this 12 hours
temporarily because of all the long blocks to mine issue. We'll adjust
this and reduce it again if we find that too maqny forks exist.

Author: NullSoldier

ironfish/src/consensus/consensus.ts

@@ -28,7 +28,7 @@ export const GENESIS_SUPPLY_IN_IRON = 42000000
 /**
  * The oldest the tip should be before we consider the chain synced
  */
-export const MAX_SYNCED_AGE_MS = 60 * 1000
+export const MAX_SYNCED_AGE_MS = 12 * 60 * 60 * 1000
 
 /**
  * The maximum allowed requested blocks by the network