Calculate block alignment properly

*sigh* This happens when you copy the formula from somewhere else... Let's do it correctly now and fix the source in plVoiceChat as well.

Sources/Plasma/FeatureLib/pfMoviePlayer/plMoviePlayer.cpp

@@ -374,7 +374,7 @@ bool plMoviePlayer::Start()
     header.fNumChannels = audio->GetChannels();
     header.fBitsPerSample = audio->GetBitDepth() == 8 ? 8 : 16;
     header.fNumSamplesPerSec = 48000; // OPUS specs say we shall always decode at 48kHz
-    header.fBlockAlign = header.fNumChannels * header.fBitsPerSample / 2;
+    header.fBlockAlign = header.fNumChannels * header.fBitsPerSample / 8;
     header.fAvgBytesPerSec = header.fNumSamplesPerSec * header.fBlockAlign;
     fAudioSound.reset(new plWin32VideoSound(header));
     int error;

Sources/Plasma/PubUtilLib/plAudio/plVoiceChat.cpp

@@ -435,7 +435,7 @@ bool plVoiceSound::LoadSound( bool is3D )
     header.fBitsPerSample  = 16;
     header.fNumChannels = 1;
     header.fNumSamplesPerSec = FREQUENCY;
-    header.fBlockAlign = header.fNumChannels * header.fBitsPerSample / 2;
+    header.fBlockAlign = header.fNumChannels * header.fBitsPerSample / 8;
     header.fAvgBytesPerSec = header.fNumSamplesPerSec * header.fBlockAlign;
 
     fDSoundBuffer = new plDSoundBuffer(0, header, true, false, false, true);