Update settings file to remove redundant setting.

config/vufind/SierraRest.ini

@@ -59,9 +59,6 @@ use_prefixed_ids = false
 ; used (redirect_uri above is not set).
 username_field = "code"
 password_field = "pin"
-; Some library systems use a four digit access pin. Others prefer to have alpha numeric
-; passwords. set digits_only to true for pin functionality. Default is false (alpha-num).
-digits_only = true
 ; Authentication method to use with global patron data access. Default is "native".
 ; "ldap" is supported for REST API v6 and later (see api_version above).
 ; IMPORTANT: when using "native" authentication, the driver assumes by default that