[raudio] fix mapping of wave data in LoadWaveSamples() (#4062)

Co-authored-by: Listeria monocytogenes <listeria@disroot.org>

src/raudio.c

@@ -1304,8 +1304,8 @@ float *LoadWaveSamples(Wave wave)
 
     for (unsigned int i = 0; i < wave.frameCount*wave.channels; i++)
     {
-        if (wave.sampleSize == 8) samples[i] = (float)(((unsigned char *)wave.data)[i] - 127)/256.0f;
-        else if (wave.sampleSize == 16) samples[i] = (float)(((short *)wave.data)[i])/32767.0f;
+        if (wave.sampleSize == 8) samples[i] = (float)(((unsigned char *)wave.data)[i] - 128)/128.0f;
+        else if (wave.sampleSize == 16) samples[i] = (float)(((short *)wave.data)[i])/32768.0f;
         else if (wave.sampleSize == 32) samples[i] = ((float *)wave.data)[i];
     }