CCBC-1596: Do not use public lcb_n1x_list which is deprecated

src/n1ql/ixmgmt.cc:729:12: warning: 'lcb_n1x_list' is deprecated [-Wdeprecated-declarations]
    return lcb_n1x_list(m_instance, this, &cmd);
           ^
include/libcouchbase/ixmgmt.h:180:1: note: 'lcb_n1x_list' has been explicitly marked deprecated here
LCB_DEPRECATED2(LIBCOUCHBASE_API lcb_STATUS lcb_n1x_list(lcb_INSTANCE *instance, const void *cookie,
^
include/libcouchbase/sysdefs.h:90:36: note: expanded from macro 'LCB_DEPRECATED2'
                                   ^
include/libcouchbase/sysdefs.h:86:44: note: expanded from macro 'LCB_DEPRECATED'
                                                   ^

Change-Id: I685e9a96925c7443dfcc2e9a68f6abecc25a2195
Reviewed-on: https://review.couchbase.org/c/libcouchbase/+/190110
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Brett Lawson <brett19@gmail.com>

Author: avsej

src/n1ql/ixmgmt.cc

@@ -726,7 +726,8 @@ lcb_STATUS WatchIndexCtx::do_poll()
     cmd.callback = cb_watch_gotlist;
     lcb_log(LOGARGS(this, DEBUG), LOGFMT "Will check for index readiness of %lu indexes. %lu completed", LOGID(this),
             (unsigned long int)m_defspend.size(), (unsigned long int)m_defsok.size());
-    return lcb_n1x_list(m_instance, this, &cmd);
+
+    return do_index_list(m_instance, this, &cmd, nullptr);
 }
 
 LIBCOUCHBASE_API