Fix audio client initialization parameters

https://learn.microsoft.com/en-us/windows/win32/api/audioclient/nf-audioclient-iaudioclient-initialize

When WAASPI exclusive mode is on, I don't think it plays audio correctly. Also docs say: 
> For an exclusive-mode stream that uses event-driven buffering, the caller must specify nonzero values for hnsPeriodicity and hnsBufferDuration, and the values of these two parameters must be equal

https://pastebin.com/fEz4ED12

modules/audio_output/wasapi.c

@@ -895,8 +895,10 @@ static HRESULT Start(aout_stream_t *s, audio_sample_format_t *restrict pfmt,
         msg_Dbg(s, "audio device configured as s24");
 
     hr = IAudioClient_Initialize(sys->client, shared_mode,
-                                 AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
-                                 buffer_duration, 0, pwf, sid);
+                               AUDCLNT_STREAMFLAGS_EVENTCALLBACK,
+                               buffer_duration,
+                               shared_mode == AUDCLNT_SHAREMODE_EXCLUSIVE ? buffer_duration : 0,
+                               pwf, sid);
     CoTaskMemFree(pwf_closest);
     if (FAILED(hr))
     {