Use HandlerCallbackPtr<T> instead of std::unique_ptr<HandlerCallback<…

…T>> (part 2)

Summary:
This is a follow-up of {D55937714} with some cases missed from the original codemod because of whitespaces not being accounted for in the regex. Like the parent diff, this is a no-op.

```
$ codemod -m '(std::)?unique_ptr\s*<\s*(apache::thrift::)?HandlerCallback\s*<(.*?)>\s*' '\2HandlerCallbackPtr<\3'
```

Reviewed By: thedavekwon

Differential Revision: D55983582

fbshipit-source-id: 3181ad2a96a4ed24355a6148cd18d37dbdb0e3e6

mcrouter/lib/carbon/example/main.cpp

@@ -90,8 +90,7 @@ class ThriftHandler : virtual public hellogoodbye::thrift::HelloGoodbyeSvIf {
   }
 
   void async_eb_goodbye(
-      std::unique_ptr<
-          apache::thrift::HandlerCallback<hellogoodbye::GoodbyeReply>> callback,
+      apache::thrift::HandlerCallbackPtr<hellogoodbye::GoodbyeReply> callback,
       const hellogoodbye::GoodbyeRequest& request) override {
     LOG(INFO) << "Good bye! Thrift server " << reinterpret_cast<uintptr_t>(this)
               << " got key " << request.key_ref()->fullKey().str();