Fix accel limit bound

Author: bobrippling

libs/misc/stepcount.c

@@ -262,7 +262,7 @@ int stepcount_new(int accMagSquared) {
   accFilteredHist[1] = accFiltered;
   int a = AccelFilter_get(&accelFilter);
   if (a>32767) a=32767;
-  if (a<-32768) a=32768;
+  if (a<-32768) a=-32768;
   accFiltered = a;
 
   if (v > RAW_THRESHOLD || v < -1*RAW_THRESHOLD) {