fix(transform): fixed the issue of duplicate import statements in jsx syntax

[zzcr]

close issue：
#300

运行正常截图：

[vercel]

@zzcr is attempting to deploy a commit to the vuejs Team on Vercel.

A member of the Team first needs to authorize it.

[zzcr]

@sxzz 智子老师您好，我是OpenTiny Vue组件库的开发人员，在我们官网的演练场遇到了关于jsx会出现重复import语句的bug，提供了一版修复方案，希望您可以抽空review下这个pr

网站地址：
https://opentiny.design/tiny-vue/zh-CN/os-theme/overview