Avoid manual handling of icons in request field list items
* Use `PurpleKeyValuePair` as field list items
* Replace `icons` list with `has_icons` flag, thus fixing memleak
* Replace `purple_request_field_list_get_icons` with `purple_request_field_list_has_icons`
pidgin_status_box_add(PIDGIN_STATUS_BOX(status_box),PIDGIN_STATUS_BOX_TYPE_PRIMITIVE,NULL,_("Do not disturb"),NULL,GINT_TO_POINTER(PURPLE_STATUS_UNAVAILABLE));