Use the same preference for new and external pages

Fixes: https://bugs.launchpad.net/midori/+bug/704903

midori/midori-app.c

@@ -473,7 +473,7 @@ midori_app_command_received (MidoriApp*   app,
             MidoriNewPage open_external_pages_in;
             gboolean first;
 
-            g_object_get (app->settings, "open-external-pages-in",
+            g_object_get (app->settings, "open-new-pages-in",
                           &open_external_pages_in, NULL);
             if (open_external_pages_in == MIDORI_NEW_PAGE_WINDOW)
             {

midori/midori-websettings.c

@@ -778,6 +778,13 @@ midori_web_settings_class_init (MidoriWebSettingsClass* class)
                                      MIDORI_NEW_PAGE_TAB,
                                      flags));
 
+    /**
+     * MidoriWebSettings:open-external-pages-in:
+     *
+     * Where to open externally opened pages.
+     *
+     * Deprecated: 0.3.4
+     */
     g_object_class_install_property (gobject_class,
                                      PROP_OPEN_EXTERNAL_PAGES_IN,
                                      g_param_spec_enum (