Use correct conditional to prevent overscrolling in DayPickerGroup

Fixes #512

Author: wdullaer

library/src/main/java/com/wdullaer/materialdatetimepicker/date/DayPickerGroup.java

@@ -179,7 +179,7 @@ public void onClick(@NonNull View v) {
         // updateButtonVisibility only triggers when a scroll is completed. So a user might
         // click the button when the animation is still ongoing potentially pushing the target
         // position outside of the bounds of the dayPickerView
-        if (position >= 0 || position < dayPickerView.getCount()) {
+        if (position >= 0 && position < dayPickerView.getCount()) {
             dayPickerView.smoothScrollToPosition(position);
             updateButtonVisibility(position);
         }