功能：话题长度改为20

src/pages/forumManage/topicList/components/addTopicModal/index.tsx

@@ -98,7 +98,7 @@ const AddTopicModal: FC<ModalProps & selfProps> = ({ open, onCancel, onOk, curre
           name='gambitName'
           rules={[{ required: true, message: '请输入名称' }]}
         >
-          <Input placeholder='请输入名称' maxLength={30} prefix='#' />
+          <Input placeholder='请输入名称' maxLength={20} prefix='#' />
         </Form.Item>
         <Form.Item
           label='图标'