Better action button placement needed for Pod configuration on iPhone 5s & SE and iPod Touch

[itsmojo]

I opened this issue to replace the private trello ticket on https://trello.com/c/ebvzSjHe/83-pair-and-insert-cannula-buttons-truncated-on-iphone-5s-se. The short version for here is that depending on which path you take to get to Pod Pairing screen on an iPhone 5s or an SE, you either get a partial Pair button or this button is completely missing. See LoopKit/Loop#974 for a write up on how you get to these two different versions of the Pod Pairing screen.

The second form with the larger bolder text is actually the preferred style, but in this form the action button is completely missing on an iPhone 5s/SE and this is what a first time Loop Pod user will run into and get confused as reported in https://loop.zulipchat.com/#narrow/stream/144120-omnipod_dev/topic/iPhone.20SE.20Pod.20Pairing.20screen/near/166330440.

See https://loop.zulipchat.com/#narrow/stream/144120-omnipod_dev/topic/iPhone.20SE.20Pod.20Pairing.20screen/near/166642227 for the issue that needs fixing.

The Setup Complete screen doesn't currently have its action button on the bottom. Not sure if this is a separate Pod setup screen layout inconsistency issue or if perhaps if it might be OK if the Pod setup action button placement could be adjusted up from the bottom which could be another potential way to deal with the Pod Pairing screen layout issues.