Revert "[BUGFIX] Fix assignment in class.dmailer.php"

Wrong author in Unit Test header (copied from T3 core)

This reverts commit f17270b4ba17e0ee45f0bee527ba2d6342b9216a

Change-Id: I743924daa907ec1ce18120d71f1912e49fa7ade3
Reviewed-on: https://review.typo3.org/26457
Reviewed-by: Bernhard Kraft
Tested-by: Bernhard Kraft