1.2.59中使用@JSONField注解指定属性序列化使用单引号后不生效

[Omega-Ariston]

在尝试修复 #2355 的时候发现的bug，复现代码：

    public static void main(String[] args) {
        Person person = new Person();
        person.setName("Ariston");
        person.setAge(23);
        String json = JSON.toJSONString(person);
        System.out.println(json);
    }

    static class Person {

        @JSONField(serialzeFeatures = SerializerFeature.UseSingleQuotes)
        private String name;

        private int age;

        public String getName()
        {
            return name;
        }

        public void setName( String name )
        {
            this.name = name;
        }

        public int getAge()
        {
            return age;
        }

        public void setAge( int age )
        {
            this.age = age;
        }
    }

输出字符串为：{"age":23,"name":"Ariston"}，而不是{"age":23,'name':'Ariston'}
经测试，注解放在getter方法上也会失效，已定位到问题，稍后提pr修复