Alter Inline Entity Form's add form in Drupal 8

See our fix in action… well, as committed to the code.

As noted, we needed to do a form alter on the regular entity’s add/edit form and a form alter on the inline entity form in order for the same fix to be reflected in both places. Have not yet figured out if there’s some way to make our form alter happen soon enough that IEF inherits it, if that’s the way it works at all.

The helpful answer:

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