Libraries: Use default constructors/destructors in LibIPC

https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#cother-other-default-operation-rules

"The compiler is more likely to get the default semantics right and
you cannot implement these functions better than the compiler."

Userland/Libraries/LibIPC/Connection.cpp

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2022, the SerenityOS developers.
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -19,10 +20,6 @@ ConnectionBase::ConnectionBase(IPC::Stub& local_stub, NonnullOwnPtr<Core::Stream
     m_responsiveness_timer = Core::Timer::create_single_shot(3000, [this] { may_have_become_unresponsive(); });
 }
 
-ConnectionBase::~ConnectionBase()
-{
-}
-
 ErrorOr<void> ConnectionBase::post_message(Message const& message)
 {
     return post_message(message.encode());