[BUGFIX] Make BCrypt the default hashing strategy (again)
In https://review.typo3.org/5756 the default hashing strategy was
changed to BCrypt. Later, in https://review.typo3.org/6598, support for
multiple strategies was added. But that change make PBKDF2 the default
This change fixes that and makes the SaltedMd5 strategy available in
the YAML file as well (for completeness).