[SinglePointLogin] fix passwordAuthenticate accessing $_POST superglobal #4356
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This remove the $_POST['username'] in favor of $username variable passed to the function as a parameter.
It fixes
PHP Fatal error: Uncaught TypeError: Argument 1 passed to SinglePointLogin::accountLocked() must be of the type string, null given
occurring because the API consumes 'application/json' content-type and $_POST is populated only;