ITS#9339 Fix syncrepl_monitor_init for dynamic monitor backend

Calling from backend.c only works if back-monitor is a static backend

servers/slapd/backend.c

@@ -116,8 +116,10 @@ int backend_init(void)
 
 		LDAP_STAILQ_INSERT_TAIL(&backendInfo, bi, bi_next);
 	}
+#if defined(SLAPD_MONITOR) && SLAPD_MONITOR == SLAPD_MOD_STATIC
 	/* HACK: need schema defined in deterministic order */
 	syncrepl_monitor_init();
+#endif
 
 
 	if ( nBackendInfo > 0) {

servers/slapd/syncrepl.c

@@ -7069,6 +7069,7 @@ add_syncrepl(
 		si->si_cookieState->cs_ref++;
 
 		si->si_next = NULL;
+		syncrepl_monitor_init();
 
 		return 0;
 	}