Round off when calculate next step in Seekbar

When the positions for the new step is calculated in
a Seekbar, a rounding error can appear.
This is fixed by round off before casting.

Change-Id: Ie2cf201ef670ccc2297e9bc4c7f415a826e44a41
Merge "Round off when calculate next step in Seekbar" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0