Amount to send field now goes up/down 1 DOGE at a time (#1441)

src/qt/bitcoinamountfield.cpp

@@ -25,7 +25,7 @@ public:
     explicit AmountSpinBox(QWidget *parent):
         QAbstractSpinBox(parent),
         currentUnit(BitcoinUnits::BTC),
-        singleStep(100000) // satoshis
+        singleStep(100000000) // koinu
     {
         setAlignment(Qt::AlignRight);