Extract unsigned tx from the SignParam structure (#1561)

* change sign_transaction method

* clippy

* rustup update && clippy

* remove redudnant clone

bridges/primitives/test-utils/src/keyring.rs

@@ -43,7 +43,7 @@ impl Account {
 	pub fn secret(&self) -> SecretKey {
 		let data = self.0.encode();
 		let mut bytes = [0_u8; 32];
-		bytes[0..data.len()].copy_from_slice(&*data);
+		bytes[0..data.len()].copy_from_slice(&data);
 		SecretKey::from_bytes(&bytes)
 			.expect("A static array of the correct length is a known good.")
 	}