[BUGFIX] eu_ldap upgrade wizard should not strip ldaps:// scheme

Change-Id: I9a19a48628fbb9012801290e392571aebd4b9507
Reviewed-on: http://review.typo3.org/32262
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>