message: Don't refresh staking icon when closing
diff: @@ -1339,6 +1339,9 @@ void BitcoinGUI::updateWeight(CWalletRef pwalletMain)
  void BitcoinGUI::updateStakingIcon()
  {
  + if(ShutdownRequested())
  + return;
  +
  CWalletRef pwalletMain = vpwallets.empty() ? 0 : vpwallets[0];
  if(!pwalletMain)
  return;
  