[Core] Show units in value editor VarSet dialog

Before this change, the units were not shown in the editor for values.
With this change the units (if applicable) are shown in the editor.

src/Gui/Dialogs/DlgAddPropertyVarSet.cpp

@@ -251,7 +251,9 @@ void DlgAddPropertyVarSet::addEditor(PropertyEditor::PropertyItem* propertyItem,
     editor.reset(propertyItem->createEditor(this, [this]() {
         this->valueChanged();
     }));
-    propertyItem->setEditorData(editor.get(), QVariant());
+    propertyItem->setEditorData(
+            editor.get(),
+            propertyItem->data(PropertyEditor::PropertyItem::ValueColumn, Qt::EditRole));
     editor->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
     editor->setObjectName(QStringLiteral("editor"));
     auto formLayout = qobject_cast<QFormLayout*>(layout());