logic: color scheme fixes (#821)

* fixed issues where color scheme entries were missing
* removed color scheme entries for nodes and edges that do not exist anymore

src/lib_gui/qt/view/QtStatusView.cpp

@@ -68,7 +68,7 @@ void QtStatusView::refreshView()
 	m_onQtThread([this]() {
 		QWidget* widget = QtViewWidgetWrapper::getWidgetOfView(this);
 		utility::setWidgetBackgroundColor(
-			widget, ColorScheme::getInstance()->getColor("error/background"));
+			widget, ColorScheme::getInstance()->getColor("window/background"));
 
 		QPalette palette(m_showErrors->palette());
 		palette.setColor(