src: remove outdated domain reference

PR-URL: #18291
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: apapirovski

src/env.h

@@ -249,7 +249,6 @@ class ModuleWrap;
   V(subject_string, "subject")                                                \
   V(subjectaltname_string, "subjectaltname")                                  \
   V(syscall_string, "syscall")                                                \
-  V(tick_domain_cb_string, "_tickDomainCallback")                             \
   V(ticketkeycallback_string, "onticketkeycallback")                          \
   V(timeout_string, "timeout")                                                \
   V(tls_ticket_string, "tlsTicket")                                           \