[#506] FIX is not active and the client sends the challenge for code …

…verification the auth server doesn't check the code, but accepts any code challenge (#685)

openam-oauth2/src/main/java/org/forgerock/oauth2/core/AuthorizationCodeGrantTypeHandler.java

@@ -153,7 +153,7 @@ public AccessToken handle(OAuth2Request request, ClientRegistration clientRegist
                 throw new InvalidGrantException("Authorization code expired.");
             }
 
-            if (providerSettings.isCodeVerifierRequired()) {
+            if (codeVerifier != null) {
                 checkCodeVerifier(authorizationCode, codeVerifier);
             }