gtk4: Use GtkPicture in diplodlg
Use GtkPicture instead of GtkImage in gtk4-client diplodlg for the flags and thumb icons. That makes them to display on their correct size, and not in icon size.
Version that applies to S3_1
Use GtkPicture instead of GtkImage in gtk4-client diplodlg for the flags and thumb icons. That makes them to display on their correct size, and not in icon size.