This change mirrors a similar one to

django.forms.widgets.CopyableInputWidget. A change in Django's form

rendering meant that calling the TextInput superclass' render() method

was still using self.template_name, which would end up rendering two

copies of the template, one of which was broken. This change makes it so

we explicitly render the text input template for that part of the

display.

Loaded the OAuth application edit form. Saw that the client secret

  widget displayed correctly, and that the "Regenerate client secret"

  button worked correctly.
Ran unit tests on all supported versions of Python.