Use eqeqeq for user entered passphrase on registration

[toschdev]

Currently the passphrase check in Lisk-UI might contain an error of the user inserted passphrase.

The code, where $scope.newPassphrase is the 12 word mnemonic generated passphrase and pass is user inserted passphrase.

Javascript == operator might not check properly, === or in this case !== should be used.

if (!Mnemonic.isValid(pass) || $scope.newPassphrase != pass) {
    $scope.noMatch = true;
}