BHV-9832 Update scroller sample to correct spacing issue

After spacing changed horizontally or vertically
setupBounds still remained as previous value.
This commit will fix it.

Enyo-DCO-1.1-Signed-off-by: David Um david.um@lge.com
This may fix the issue, but I don't think we want it in a sample, since it's not something we would support application developers doing (it's effectively using a private API).

If we think this issue represents something that real-world app developers might encounter, we can consider adding a public API -- but for now, I recommend that we not worry about this issue, since it's very specific to this sample.