simplify and use the same code for Qt5 & Qt6

When reading and comparing Qt5-docs and Qt6-docs, I read,
that there are no differences in the functions!
So it is not necessary to have the differentiation
between the Qt-Versions.
Code compiles without errors or warnings for Qt5 and Qt6.

sources/editor/graphicspart/partterminal.cpp

@@ -84,18 +84,8 @@ void PartTerminal::paint(
 	QPen t;
 	t.setWidthF(1.0);
 
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)	// ### Qt 6: remove
-	t.setCosmetic(options && options -> levelOfDetail < 1.0);
-#else
-#if TODO_LIST
-#pragma message("@TODO remove code for QT 6 or later")
-#endif
-	t.setCosmetic(
-				options
-				&& options->levelOfDetailFromTransform(
-					painter->worldTransform())
-				< 1.0);
-#endif
+	t.setCosmetic(options && options -> levelOfDetailFromTransform(painter->worldTransform()) < 1.0);
+
 	// dessin de la borne en rouge
 	t.setColor(isSelected() ? Terminal::neutralColor : Qt::red);
 	painter -> setPen(t);