Order pane and customer data bugfixes

Problem/Motivation

While I was working on the Backdrop version of this module, I ran into some elements that weren't working as expected. I made a commit over there -- if you have a moment to take a quick glance and let me know if you'd like me to submit a patch here based on that, I'd be happy to do so.

I was finding that the Order pane (e.g. the "Stripe Customer info:" pane when viewing an order) was not showing up and once I got that displaying it didn't seem to have the customer data in it. This commit fixes both on Backdrop. If things are working as expected for you it's possible this isn't needed for Drupal 7.

Here is the commit I'm referring to:

• https://github.com/backdrop-contrib/uc_stripe/commit/c526ed5185739d56074...

If you'd like me to submit a similar patch for D7 please let me know.