fix: Fix regression in ConnectAttempt (#5900)

A regression was introduced in #5669 which would cause rippled to potentially dereference a disengaged std::optional when connecting to a peer. This would cause UB in release build and crash in debug.

Co-authored-by: Bart Thomee <11445373+bthomee@users.noreply.github.com>

src/xrpld/overlay/detail/ConnectAttempt.cpp

@@ -600,8 +600,8 @@ ConnectAttempt::processResponse()
             JLOG(journal_.info()) << "Cluster name: " << *member;
         }
 
-        auto const result =
-            overlay_.peerFinder().activate(slot_, publicKey, !member->empty());
+        auto const result = overlay_.peerFinder().activate(
+            slot_, publicKey, member.has_value());
         if (result != PeerFinder::Result::success)
         {
             std::stringstream ss;