Removed extra semicolon

src/main/java/br/com/luizcarlosvianamelo/keycloak/broker/oidc/mappers/ClaimToGroupMapper.java

@@ -289,6 +289,6 @@ public class ClaimToGroupMapper extends AbstractClaimMapper {
     }
 
     private static boolean isEmpty(String str) {
-        return str == null || str.length() == 0;;
+        return str == null || str.length() == 0;
     }
 }