Use the target system's boot name in partitioning summary widget.

src/modules/partition/gui/PartitionViewStep.cpp

@@ -250,6 +250,8 @@ PartitionViewStep::createSummaryWidget() const
         previewLabels->setModel( info.partitionModelAfter );
         preview->setSelectionMode( QAbstractItemView::NoSelection );
         previewLabels->setSelectionMode( QAbstractItemView::NoSelection );
+        previewLabels->setCustomNewRootLabel( Calamares::Branding::instance()->
+                                              string( Calamares::Branding::BootloaderEntryName ) );
         info.partitionModelAfter->setParent( widget );
         field = new QVBoxLayout;
         CalamaresUtils::unmarginLayout( field );