recolor function of UBGraphicsTextItem should use scene's isDarkBackground instead of settings

src/domain/UBGraphicsTextItem.cpp

@@ -246,9 +246,6 @@ void UBGraphicsTextItem::keyReleaseEvent(QKeyEvent *event)
 
 void UBGraphicsTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
 {
-    QColor color = UBSettings::settings()->isDarkBackground() ? mColorOnDarkBackground : mColorOnLightBackground;
-    setDefaultTextColor(color);
-
     // Never draw the rubber band, we draw our custom selection with the DelegateFrame
     QStyleOptionGraphicsItem styleOption = QStyleOptionGraphicsItem(*option);
     styleOption.state &= ~QStyle::State_Selected;

src/domain/UBGraphicsTextItemDelegate.cpp

@@ -743,7 +743,7 @@ void UBGraphicsTextItemDelegate::recolor()
 
 
         //setting new parameters
-        if (UBSettings::settings()->isDarkBackground())
+        if (delegated()->scene()->isDarkBackground())
         {
             if (curBrush.color() == Qt::black)
             {