Remove duplicate LMDB wallet backend code (#101)

* remove leftover wallet lmdb code

* rustfmt

impls/src/test_framework/mod.rs

@@ -25,10 +25,10 @@ use crate::libwallet::api_impl::{foreign, owner};
 use crate::libwallet::{
 	BlockFees, CbData, InitTxArgs, NodeClient, WalletBackend, WalletInfo, WalletInst,
 };
-use crate::lmdb_wallet::LMDBBackend;
 use crate::util;
 use crate::util::secp::pedersen;
 use crate::util::Mutex;
+use crate::LMDBBackend;
 use crate::WalletSeed;
 use chrono::Duration;
 use std::sync::Arc;