[Security] Fix method for the user password hasher service

[samnela]

No description provided.

[javiereguiluz]

@chalasr just asking, why does the UserPasswordHasher define methods like hashPassword() instead of implementing the PasswordHasherInterface, which uses methods like hash()? Thanks!

[chalasr]

@javiereguiluz It cannot implement nor extend the PasswordHasherInterface as there would be a signature mismatch (the $user parameter only exists in UserPasswordHasherInterface).
I guess you are mostly wondering about why they have a different name, and I have to admit that I don't know.
Maybe it was in the hope of making it clear that it's about hashing the password for the passed user, but I'm not sure it does.

[javiereguiluz]

Thanks Samuel ... and thanks Robin for the review!