头部插槽编辑问题

**Describe the bug**
表格头部添加两个同样的自定义插槽，修改其中一个的属性，另外一个插槽也会跟着一起改变

**To Reproduce**
Steps to reproduce the behavior:
1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- Drip-table version:
- Drip-table-generator version (optional):
- React version:
- OS: [e.g. iOS]
- Browser [e.g. chrome, safari]
- Version [e.g. 22]

**Smartphone (please complete the following information):**
- Drip-table version:
- Drip-table-generator version (optional):
- React version:
- Device: [e.g. iPhone6]
- OS: [e.g. iOS8.1]
- Browser [e.g. stock browser, safari]
- Version [e.g. 22]

**Additional context**
Add any other context about the problem here.