contract/money/cargo: added missing blockchain darkfi feature

src/contract/money/Cargo.toml

@@ -15,7 +15,7 @@ darkfi-serial = { path = "../../serial", features = ["derive", "crypto"] }
 # The following dependencies are used for the client API and
 # probably shouldn't be in WASM
 chacha20poly1305 = { version = "0.10.1", optional = true }
-darkfi = { path = "../../../", features = ["zk", "rpc"], optional = true }
+darkfi = { path = "../../../", features = ["zk", "rpc", "blockchain"], optional = true }
 halo2_proofs = { version = "0.2.0", optional = true }
 log = { version = "0.4.17", optional = true }
 rand = { version = "0.8.5", optional = true }