Fixed parameter reference error in test.py

Author: shaoziyang

misc/DS3231/test.py

@@ -19,6 +19,6 @@
 
 ds.DateTime([2018,3,12,1,22,10,0])
 
-ds.ALARM(12, 20, 10, ds.PER_DISABLE)
-ds.ALARM(12, 20, 10, ds.PER_DAY)
-ds.ClearALARM()
+ds.ALARM(12, 20, 10, DS3231.PER_DISABLE)
+ds.ALARM(12, 20, 10, DS3231.PER_DAY)
+ds.ClearALARM()