Make 'Ultimaker B.V.' preferred manufacturer rather than 'Ultimaker'

Ultimaker was the category. Ultimaker B.V. is the manufacturer, which is now used as the section property.

Contributes to issue CURA-6635.

resources/qml/WelcomePages/AddLocalPrinterScrollView.qml

@@ -24,7 +24,7 @@ Item
     // The currently active (expanded) section/category, where section/category is the grouping of local machine items.
     property string currentSection: preferredCategory
     // By default (when this list shows up) we always expand the "Ultimaker" section.
-    property string preferredCategory: "Ultimaker"
+    property string preferredCategory: "Ultimaker B.V."
 
     property int maxItemCountAtOnce: 10  // show at max 10 items at once, otherwise you need to scroll.