spec: wait for close button to show up on wiki
spec: wait for close button to show up on wiki

refs CNVS

test plan 
 - specs should pass

Change-Id: I7f9c7d36030034a5f3dd5838b664c670c61a5d3b
Reviewed-on: https://gerrit.instructure.com/72412
Tested-by: Jenkins
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>
Product-Review: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>
QA-Review: Rob Orton <7e09c9d3e96378bf549fc283fd6e1e5b7014cc33@instructure.com>

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