Fix cancel button in the page of project edit not work (#23655)

Fix cancel button in the page of project edit not work (#23655)

Before, in project edit page, the cancel button is not work.

https://user-images.githubusercontent.com/33891828/227182731-6478e29f-0e52-48c4-beb0-6a7d1dda6a1d.mov

1. The wrong classname `cancel` was added to the `<a>` tag. That
classname caused the default click event of `<a>` tag to be cancelled.
Because we have the following settings in the global. So I remove the
classname `cancel`.

https://github.com/go-gitea/gitea/blob/9be90a58754061171bbd5025d85d2b891364efd3/web_src/js/features/common-global.js#L325-L327

2. Another change is that page will redirect to the previous page.

https://user-images.githubusercontent.com/33891828/227187326-c653c6d6-9715-440f-a732-ba0a6f012c81.mov