fix: update UpdateFilteredPolicies method

[tangyang9464]

Signed-off-by: tangyang9464 tangyang9464@163.com

fix: #33

[hsluoyz]

@antipopp plz review.

[antipopp]

It works only once in my setup. The first time I run:

_, err := enforcer.UpdatePolicy([]string{"admin", "domain1", "users", "allow"}, []string{"admin", "domain1", "users", "deny"})
    if err != nil {
        return err
    }

it works, but then if I run:

_, err := enforcer.UpdatePolicy([]string{"admin", "domain1", "users", "deny"}, []string{"admin", "domain1", "users", "allow"})
    if err != nil {
        return err
    }

the function still returns true and no errors, but nothing changes in the DB.

[tangyang9464]

@antipopp fixed.

[antipopp]

works as intended, thank you!

[github-actions[bot]]

:tada: This PR is included in version 1.0.3 :tada:

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