fix: 修复 运行npm run lint:stylelint命令时，无法识别less内置函数 (#1736)

删除 stylelint.config.js文件 rules中重复的selector-class-pattern
Co-authored-by: NMicah <yumingsheng@hrbeu.edu.cn>

stylelint.config.js

@@ -4,7 +4,7 @@ module.exports = {
   extends: ['stylelint-config-standard', 'stylelint-config-prettier'],
   customSyntax: 'postcss-html',
   rules: {
-    'selector-class-pattern': null,
+    'function-no-unknown': null,
     'selector-class-pattern': null,
     'selector-pseudo-class-no-unknown': [
       true,