Do not paint focus on disabled components

[kschaefe]

It is possible for a component to be disabled while it has focus. Component.hasFocus will still return true. SubstanceCoreUtilities.paintFocus (line 1581) should request the focus strength with a combination of hasFocus and isEnabled:

float focusStrength = transitionAwareUI.getTransitionTracker()
.getFocusStrength(focusedComp.hasFocus() && focusedComp.isEnabled());

This will allow disabled component to not paint focus.