libnma/vpn-password-dialog: drop use of GtkWidget.no-show-all property
It's going away in Gtk4. We don't do show_all() anyway -- just hide the widgets by default. This commit brings back parts of 07d900c0 ("libnma: drop use of GtkWidget.no-show-all property") that was unnecessarily reverted in f56334c3 ("Revert "libnma: drop use of GtkWidget.no-show-all property"") with another fix folded in. !24
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