batch-rename-dialog: Don't use GtkContainer::add()

Instead of creating GtkListBoxRows directly, we can just create their
child widget and use GtkListBox::insert() method directly.

This prepares for GTK4, where GtkContainer is gone.
2 jobs for wip/antoniof/gtk4-preparation-batch-rename-dialog in 5 minutes and 38 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed flatpak devel #1456490
flatpak

00:05:38

passed style check #1456491

00:01:42