osmAccountDialog: Make use of Adw.Window
Since Gtk.Dialog is deprecated let's use Adw.Window instead.
This commit also makes visual changes to the dialog, such as using more up to date design patterns from the GNOME visual style.
See #577
Since Gtk.Dialog is deprecated let's use Adw.Window instead.
This commit also makes visual changes to the dialog, such as using more up to date design patterns from the GNOME visual style.
See #577