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
Tweak Blue to Grey

Change-Id: I77ea1bf6ec23bdf23e04bf2344241819ce033787