knowledgeDocumentCard: don't hide toolbar frame in allocate
knowledgeDocumentCard: don't hide toolbar frame in allocate

We were directly setting visible in allocate, which is bad, should
use child_visible instead. But because we know when instantiating
the card if the frame will be visible or not, we can just set visible
on init.

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib