[BUGFIX] Use defaultMailFromName setting in install tool

The defaultMailFromName setting is not used for sending
the test mails in the install tool.

Resolves: #60758
Releases: master, 6.2
Change-Id: I35e1b887de6b06bb5f301e037d6d412c18ac0b37
Reviewed-on: http://review.typo3.org/32151
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>