set new theme in init(coder:) to apply to cardCellMargins in storyboards

[rcole34]

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[badrinathvm]

@rcole34
required init?(coder: NSCoder) { CardPartsMintTheme().apply() super.init(coder: coder) } gets called much before than ApplDelegate's func application(_ application: UIApplication, didFinishLaunchingWithOptions method.. This is good.

[croossin]

I think it would be good to also update the documentation for Applying a theme since we state you should set in AppDelegate -- just add an extra note about using Storyboards.

[croossin]

Looks good.