Fix new issue/pull request btn margin when it is next to sort (#23647)
Close #23627
Added margin left to the button when it is next to the svg, which has a
margin-right of `-0.5rem`
And here it might be better if `white-space: nowrap;` is added because
otherwise it might look like below on pull requests page on smaller
screen
<img width="945" alt="截屏2023-03-23 09 57 41"
src="https://user-images.githubusercontent.com/17645053/227079613-71c696ab-55ec-4641-acb9-622a8baebb31.png">
After:
<img width="936" alt="截屏2023-03-23 10 08 27"
src="https://user-images.githubusercontent.com/17645053/227080971-6bf2588e-40dd-4770-b0d1-45d7c63e0f48.png">
Pull Request on smaller screen
<img width="922" alt="截屏2023-03-23 10 25 16"
src="https://user-images.githubusercontent.com/17645053/227084144-0c2ed3e6-5c11-4252-bba2-b5f971b70f4a.png">
authored by