Remove "inverted" class on creating new label and cancel buttons (#24030)
"inverted" class might not be needed because background of these two
buttons is light color.
inverted related rule from `semantic.css`:
```css
.ui.inverted.green.basic.buttons .button,
.ui.inverted.green.buttons .basic.button,
.ui.inverted.green.basic.button {
background-color: transparent;
box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.5) inset;
color: #FFFFFF;
}
```
Before:
<img width="771" alt="截屏2023-04-10 17 21 22"
src="https://user-images.githubusercontent.com/17645053/230873878-cc64b3d6-ffa9-4cae-9280-07b06f7829b2.png">
After:
<img width="765" alt="截屏2023-04-10 17 22 14"
src="https://user-images.githubusercontent.com/17645053/230873956-9412054f-b739-4878-9ee9-57ff65eb7910.png">
f9d6092cfe
