PulseAudio: Use the channel map used when initializing the PA stream.

This is an attempt to work around an issue with PipeWire.

miniaudio.h

@@ -30177,7 +30177,6 @@ static ma_result ma_device_init__pulse(ma_device* pDevice, const ma_device_confi
     ma_pa_channel_map cmap;
     ma_pa_buffer_attr attr;
     const ma_pa_sample_spec* pActualSS   = NULL;
-    const ma_pa_channel_map* pActualCMap = NULL;
     const ma_pa_buffer_attr* pActualAttr = NULL;
     ma_uint32 iChannel;
     ma_pa_stream_flags_t streamFlags;
@@ -30335,11 +30334,6 @@ static ma_result ma_device_init__pulse(ma_device* pDevice, const ma_device_confi
         fixed sooner than later. I might remove this hack later.
         */
         if (pDescriptorCapture->channels > 2) {
-            pActualCMap = ((ma_pa_stream_get_channel_map_proc)pDevice->pContext->pulse.pa_stream_get_channel_map)((ma_pa_stream*)pDevice->pulse.pStreamCapture);
-            if (pActualCMap != NULL) {
-                cmap = *pActualCMap;
-            }
-
             for (iChannel = 0; iChannel < pDescriptorCapture->channels; ++iChannel) {
                 pDescriptorCapture->channelMap[iChannel] = ma_channel_position_from_pulse(cmap.map[iChannel]);
             }
@@ -30489,11 +30483,6 @@ static ma_result ma_device_init__pulse(ma_device* pDevice, const ma_device_confi
         fixed sooner than later. I might remove this hack later.
         */
         if (pDescriptorPlayback->channels > 2) {
-            pActualCMap = ((ma_pa_stream_get_channel_map_proc)pDevice->pContext->pulse.pa_stream_get_channel_map)((ma_pa_stream*)pDevice->pulse.pStreamPlayback);
-            if (pActualCMap != NULL) {
-                cmap = *pActualCMap;
-            }
-
             for (iChannel = 0; iChannel < pDescriptorPlayback->channels; ++iChannel) {
                 pDescriptorPlayback->channelMap[iChannel] = ma_channel_position_from_pulse(cmap.map[iChannel]);
             }