fix sound effects playing at 100x intended volume (#965)

yes, literally One Hundred Times louder than they're supposed to be

src/aosfxplayer.cpp

@@ -109,7 +109,7 @@ void AOSfxPlayer::setMuted(bool toggle)
 
 void AOSfxPlayer::updateInternalVolume()
 {
-  float volume = m_muted ? 0.0f : m_volume;
+  float volume = m_muted ? 0.0f : (m_volume * 0.01);
   for (int i = 0; i < STREAM_COUNT; ++i)
   {
     BASS_ChannelSetAttribute(m_stream[i], BASS_ATTRIB_VOL, volume);