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 13 minutes and 14 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Test
passed flatpak #1570089
flatpak

00:13:14

passed style check #1570090

00:05:16