change high precision mode to 30 bits again after making the code less overflow sensitive

Originally committed as revision 8481 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/resample2.c

@@ -40,7 +40,7 @@
 #define FELEM_MIN INT16_MIN
 #define WINDOW_TYPE 9
 #elif !defined(CONFIG_RESAMPLE_AUDIOPHILE_KIDDY_MODE)
-#define FILTER_SHIFT 22
+#define FILTER_SHIFT 30
 
 #define FELEM int32_t
 #define FELEM2 int64_t