simplewallet: set manual refresh mode in rescan_bc

This ensures we get asked for the password if needed

src/simplewallet/simplewallet.cpp

@@ -8786,6 +8786,8 @@ bool simple_wallet::rescan_blockchain(const std::vector<std::string> &args_)
     }
   }
 
+  m_in_manual_refresh.store(true, std::memory_order_relaxed);
+  epee::misc_utils::auto_scope_leave_caller scope_exit_handler = epee::misc_utils::create_scope_leave_handler([&](){m_in_manual_refresh.store(false, std::memory_order_relaxed);});
   return refresh_main(start_height, reset_type, true);
 }
 //----------------------------------------------------------------------------------------------------