Improved: Hide F2F Action Image When Not Sending In Message

We improved volunteers' view of a F2F action by not showing the action's image above the script preview if that image is not actually going to be sent with the F2F message(s).

Admins can toggle "Attach action image to all initial scripts" on the F2F action edit page; that toggle controls whether the action's image is included in the message that volunteers copy to send F2F messages. While it was always true that the image would only actually be included in the message when that setting was toggled ON, the image would previously show in the volunteer's preview even though it wasn't actually going to be sent; that is now removed, so the image does not display if it will not be attached to the message.