Provide means to set prefersStatusBarHidden for BTCardFormViewController

[csfrank-nib]

Is your feature request related to a problem? Please describe.

I would like the option to ensure that the status bar remains visible when BTCardFormViewController is presented.

I think it makes sense to provide a property for this through BTDropInUICustomization and to propagate this through to prefersStatusBarHidden within BTCardFormViewController.

This is the current behaviour (observe the status bar across these videos):

Actual.mp4

And this is the behaviour I would like:

Desired.mp4

Describe the solution you'd like.

As a developer for an application that embeds the BTDropIn library, I want to set the prefersStatusBarHidden value of BTCardFormViewController to NO because it better represents our application's design language.