only our entity version may be stored in our storage layer. removed TODO.

openid-connect-common/src/main/java/org/mitre/oauth2/model/OAuth2AccessTokenEntity.java

@@ -217,7 +217,6 @@ public class OAuth2AccessTokenEntity implements OAuth2AccessToken {
 
 	public void setRefreshToken(OAuth2RefreshToken refreshToken) {
 		if (!(refreshToken instanceof OAuth2RefreshTokenEntity)) {
-			// TODO: make a copy constructor instead....
 			throw new IllegalArgumentException("Not a storable refresh token entity!");
 		}
 		// force a pass through to the entity version