gtk4: Make popup image to use natural size

Ignore image size parameters to popup_image(). They are
to be removed completely.

See RM #669

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>

client/gui-gtk-4.0/dialogs.c

@@ -1673,15 +1673,17 @@ void request_action_confirmation(const char *expl,
 /**********************************************************************//**
   Popup image window
 **************************************************************************/
-void popup_image(const char *tag, int width, int height)
+void popup_image(const char *tag, int width_discard, int height_discard)
 {
   struct sprite *spr = load_popup_sprite(tag);
 
   if (spr != NULL) {
     GdkPixbuf *pix = sprite_get_pixbuf(spr);
     GtkWidget *win = gtk_window_new();
     GtkWidget *img = gtk_image_new_from_pixbuf(pix);
+    int width, height;
 
+    get_sprite_dimensions(spr, &width, &height);
     gtk_window_set_default_size(GTK_WINDOW(win), width, height);
     gtk_window_set_child(GTK_WINDOW(win), img);
     gtk_widget_show(win);