[calamares] Apply coding style

src/calamares/progresstree/ProgressTreeView.cpp

@@ -76,9 +76,10 @@ ProgressTreeView::setModel( QAbstractItemModel* model )
     QTreeView::setModel( model );
     expandAll();
 
-    connect( Calamares::ViewManager::instance(),
+    connect(
-             &Calamares::ViewManager::currentStepChanged,
+        Calamares::ViewManager::instance(),
-             this,
+        &Calamares::ViewManager::currentStepChanged,
-             [this]() { viewport()->update(); },
+        this,
-             Qt::UniqueConnection );
+        [this]() { viewport()->update(); },
+        Qt::UniqueConnection );
 }