Fix regression in content_type for text part after converted to multipart #1330
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This was broken by 404ecdd. It removed
the setting of the default :content_type entry for the text part, before
copying the content fields to the text part. This puts back the setting
of the default :content_type entry for the text part.
In 2.7.1:
Before this commit:
After this commit:
Regression found by Roda's mailer plugin tests.