Revert "[FEATURE] Add option to set an alternative domain for preview"

Errors in commit-msg. Patch itself okay. Will repush.

This reverts commit 989dc485492927daeeebab67200f43df49bd1d17

Change-Id: I549dfdf33dd75d8a2dcbf1d09132951d8b8d86eb
Reviewed-on: https://review.typo3.org/24729
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind