rpc: Avoid locking cs_main in some wallet RPC

src/rpc/rawtransaction.cpp

@@ -562,7 +562,6 @@ static UniValue decoderawtransaction(const JSONRPCRequest& request)
             + HelpExampleRpc("decoderawtransaction", "\"hexstring\"")
         );
 
-    LOCK(cs_main);
     RPCTypeCheck(request.params, {UniValue::VSTR, UniValue::VBOOL});
 
     CMutableTransaction mtx;