edit workshop reminder messages

[jaredwould]

Let's change the prepopulated body of the Edit Workshop Reminder Email.

Instead of pre-populating with text prompt that disappears upon click, let's prepopulate the subject and body with the text of the actual Confirmation Email attendees currently receive if hosts do not edit the message.

If the host does click the subject or body, the text should stay and they can edit it from there.

No need to include the footer that we append in the prepopulated text, as we want that to continue to always send the same.

[jaredwould]

in the Warm Up Email (optional) below it

let's remove the prepopulated text from the Body and just leave it blank.