audiotrack: don't use FLOAT, it breaks 5.1/7.1

Since 5.1 or 7.1 Float is down sampled to Stereo Float.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/audio_output/audiotrack.c

@@ -92,7 +92,8 @@ struct aout_sys_t {
 /* Soft volume helper */
 #include "audio_output/volume.h"
 
-#define AUDIOTRACK_USE_FLOAT
+// Don't use Float for now since 5.1/7.1 Float is down sampled to Stereo Float
+//#define AUDIOTRACK_USE_FLOAT
 // TODO: activate getTimestamp for new android versions
 //#define AUDIOTRACK_USE_TIMESTAMP