Recalculated layer's reusability flags after transform update

Recalculated layer's reusability flags after transform update

Layer's reusability flags were being left as true causing
some examples to fail to render properly, as render items
were being reused without being updated after a transform.

Reworked UpdateNodes to move layer reusability calculation
until after TransformManager::Update.

Change-Id: Id0e30489074ae3690984e4f95f0b3cd730d80440