Two small fixes for userWidget
userWidget: Simplify icon size setting a bit
Remove the default icon size of -1 and always set the container StBin to
a real size. This fixes an error where the "width" and "height"
properties get set to -2 (which is -1 * scaleFactor) in the _init
function.
userWidget: Always set actor size inside update()
We also want to ensure the Avatar StBin is sized correctly when an icon
child is used, so always set the actor size inside the update()
function.