Fix when the stored password in version 1.0 is verified

[alejandro-miguez]

Fix when the stored password in version 1.0 is verified due to the salted is store encoded in hex. The fixed error is due to the byte_size of the compared hashes were different and we had the failure (example below):

exception_from {bondy_password,verify_string,2} {error,badarg}
** exception error: bad argument
     in function  crypto:hash_equals_nif/2
        called as crypto:hash_equals_nif(<<254,76,219,15,117,107,76,4,142,25,228,42,58,32,145,204,
                                           31,208,213,153>>,
                                         <<"f8b1bdd6cb24f1966c44c961f4b629b3e8b120d2">>)