Fix (disabled) Wavelet sound decompression

The first chunk of Wavelet sound was decoded as ADPCM and then
following chunks were decoded as Wavelet. It played as static
noise.

Using Wavelet compression requires engine code changes to enable.

code/client/snd_mix.c

@@ -383,7 +383,7 @@ void S_PaintChannelFromWavelet( channel_t *ch, sfx_t *sc, int count, int sampleO
 	}
 
 	if (i!=sfxScratchIndex || sfxScratchPointer != sc) {
-		S_AdpcmGetSamples( chunk, sfxScratchBuffer );
+		decodeWavelet(chunk, sfxScratchBuffer);
 		sfxScratchIndex = i;
 		sfxScratchPointer = sc;
 	}