Merge #2094: [GUI] Hide shield all coins button.

575349b [GUI] send screen, hide shield all coins btn for now. (furszy)

Pull request description:

  Hiding the "shield all" functionality for now.
  Would be good to expand this functionality later on splitting big transactions into smaller ones, dividing it across blocks, adding decoys etc.

ACKs for top commit:
  random-zebra:
    ACK 575349b
  Fuzzbawls:
    ACK 575349b

Tree-SHA512: ec8f5791e08505a3dd142547639907a1319e1084476ad2839c7e19da8adfb3e5afcf21fa51ea0adea272e7d35af85b8d8d06b694993b2dd36ae0c5d9235381e3

src/qt/pivx/send.cpp

@@ -77,6 +77,7 @@ SendWidget::SendWidget(PIVXGUI* parent) :
     // Shield coins
     ui->btnShieldCoins->setTitleClassAndText("btn-title-grey", tr("Shield Coins"));
     ui->btnShieldCoins->setSubTitleClassAndText("text-subtitle", tr("Convert all transparent coins into shielded coins"));
+    ui->btnShieldCoins->setVisible(false);
 
     connect(ui->pushButtonFee, &QPushButton::clicked, this, &SendWidget::onChangeCustomFeeClicked);
     connect(ui->btnCoinControl, &OptionButton::clicked, this, &SendWidget::onCoinControlClicked);