Fix crash with XAudio2 backend when source is playing

The array containing the sources might grow and invalidate existing
pointers to sources while some of the previous sources are still playing.

Source/Engine/Audio/XAudio2/AudioBackendXAudio2.cpp

@@ -5,6 +5,7 @@
 #include "AudioBackendXAudio2.h"
 #include "Engine/Audio/AudioSettings.h"
 #include "Engine/Core/Collections/Array.h"
+#include "Engine/Core/Collections/ChunkedArray.h"
 #include "Engine/Core/Log.h"
 #include "Engine/Audio/Audio.h"
 #include "Engine/Audio/AudioSource.h"
@@ -208,8 +209,8 @@ namespace XAudio2
     bool ForceDirty = true;
     Listener Listeners[AUDIO_MAX_LISTENERS];
     CriticalSection Locker;
-    Array<Source> Sources(32); // TODO: use ChunkedArray for better performance
-    Array<Buffer*> Buffers(64); // TODO: use ChunkedArray for better performance or use buffers pool?
+    ChunkedArray<Source, 32> Sources;
+    ChunkedArray<Buffer*, 64> Buffers; // TODO: use ChunkedArray for better performance or use buffers pool?
     EngineCallback Callback;
 
     Listener* GetListener()