Everywhere: Use a forward declaration for pointers to Threading::Thread

Author: https://github.com/Zaggy1024
Commit: 2aaf53bd2c
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/6223
Reviewed-by: https://github.com/konradekk

Libraries/LibMedia/Audio/PlaybackStreamPulseAudio.cpp

@@ -4,9 +4,10 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include "PlaybackStreamPulseAudio.h"
-
 #include <LibCore/ThreadedPromise.h>
+#include <LibThreading/Thread.h>
+
+#include "PlaybackStreamPulseAudio.h"
 
 namespace Audio {
 

Libraries/LibMedia/Audio/PulseAudioWrappers.h

@@ -13,7 +13,6 @@
 #include <AK/NonnullRefPtr.h>
 #include <AK/Time.h>
 #include <LibMedia/Export.h>
-#include <LibThreading/Thread.h>
 #include <pulse/pulseaudio.h>
 
 namespace Audio {