Add Device::get_mut_sp_wallet

(cherry picked from commit 922cf2aa53b8f610e4b5f7c895ef851637c679f0)

src/device.rs

@@ -38,6 +38,10 @@ impl Device {
         &self.sp_wallet
     }
 
+    pub fn get_mut_sp_wallet(&mut self) -> &mut SpWallet {
+        &mut self.sp_wallet
+    }
+
     pub fn get_sp_client(&self) -> &SpClient {
         self.sp_wallet.get_sp_client()
     }

src/serialization.rs

@@ -1,6 +1,6 @@
 use crate::{pcd::Member, process::Process};
 use serde::de::Error;
-use serde::{de, Deserialize, Deserializer, Serialize, Serializer};
+use serde::{Deserialize, Deserializer, Serialize, Serializer};
 use sp_client::bitcoin::hex::{DisplayHex, FromHex};
 use sp_client::bitcoin::OutPoint;
 use std::collections::{BTreeMap, HashMap};