Updated Sideboard gradient colors

Wasnt happy with the first gradient, too much white. Now uses 2 shades
or purple.

cockatrice/src/deckview.cpp

@@ -151,8 +151,8 @@ void DeckViewCardContainer::paint(QPainter *painter, const QStyleOptionGraphicsI
 
         QLinearGradient grad1(0, 0, 1, 0);
         grad1.setCoordinateMode(QGradient::ObjectBoundingMode);
-        grad1.setColorAt(0, QColor(70, 50, 100));
-        grad1.setColorAt(1, QColor(170, 150, 200));
+        grad1.setColorAt(0, QColor(48, 34, 69));
+        grad1.setColorAt(1, QColor(110, 90, 140));
         painter->fillRect(QRectF(0, 0, width, height), QBrush(grad1));
 
         painter->fillRect(boundingRect(), QColor(0, 0, 0, 80));