Missing handle mapper in middleware.ts (#136)

* Update middleware.ts

No actor handle mapper is set; and use the WebFinger username  as the actor's internal handle.

* Update middleware.ts

Author: ssb2dmba

src/federation/middleware.ts

@@ -2063,6 +2063,7 @@ class FederationImpl<TContextData> implements Federation<TContextData> {
         return await handleWebFinger(request, {
           context,
           actorDispatcher: this.actorCallbacks?.dispatcher,
+          actorHandleMapper: this.actorCallbacks?.handleMapper,
           onNotFound,
         });
       case "nodeInfoJrd":