Fix the colord support in GtkPrinterCups when the PPD is loaded async

If the PPD is not available when the printer is loaded then the PPD options are
not available and we can't get the correct qualifier to use with colord.

When the PPD becomes available, refresh the profile title to reflect reality.

https://bugzilla.gnome.org/show_bug.cgi?id=674890

modules/printbackends/cups/gtkprintercups.c

@@ -505,6 +505,15 @@ colord_client_connect_cb (GObject *source_object,
 
   g_object_unref (printer);
 }
+
+static void
+colord_printer_details_aquired_cb (GtkPrinterCups *printer,
+                                   gboolean success,
+                                   gpointer user_data)
+{
+  /* refresh the device */
+  colord_update_device (printer);
+}
 #endif
 
 /**
@@ -550,6 +559,11 @@ gtk_printer_cups_new (const char      *name,
                          colord_client_connect_cb,
                          g_object_ref (printer));
     }
+
+    /* update the device when we read the PPD */
+    g_signal_connect (printer, "details-acquired",
+                      G_CALLBACK (colord_printer_details_aquired_cb),
+                      printer);
 #endif
   return printer;
 }