Hotfix: Send Regional Partner Emails from allowed address

[islemaster]

@aoby explained this:

We have a list of allowed senders here (https://github.com/code-dot-org/code-dot-org/blob/staging/lib/cdo/poste.rb#L269), though usually we send from one of the existing ones, e.g. teacher@ with an actual person's name

For example: https://github.com/code-dot-org/code-dot-org/blob/staging/dashboard/app/mailers/pd/application/teacher1920_application_mailer.rb#L52
So you can either change to from: 'Anthonette Peña <teacher@code.org>', or add her email to the allowed senders in poste

Making this change immediately to fix the broken form, while I revisit this with stakeholders to see what behavior they actually need and finding a way to reliably cover this with automated tests.

[islemaster]

Doing some manual local testing (without mailcatcher) and hoping to let Circle at least get past the build step...

[islemaster]

I assume this development.log output is what I expect to see in the success case?

Pd::RegionalPartnerContactMailer#matched: processed outbound mail in 24.3ms
Sent mail to teacher_596@code.org (21.3ms)
Date: Thu, 04 Oct 2018 10:41:02 -0700
From: =?UTF-8?B?QW50aG9uZXR0ZSBQZcOxYQ==?= <teacher@code.org>
To: teacher_596@code.org

[islemaster]

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