fix: 解决storage无法修改key的问题

[coderwang]

在storage面板执行onTapSave方法时，优先执行model.removeItem(key)会导致，状态被清理，从而model.setItem(editingKey, editingVal)无效，需优先新增key后再删除旧的key

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

wangshuhan seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}