### What?
It removes the source branch that is not necessary in the PR list (see #5009). It adds a little chevron to the right in front of the target branch. That could be replaced by words (“into”), or removed, if preferred. But, I think it looks decent like that.
### Screenshots
#### Before
#### After
### Testing
Run the development version of forgejo from the PR. For any existing repository with PRs, open the pulls list.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/6522
Reviewed-by: Otto <otto@codeberg.org>
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Robert Wolff <mahlzahn@posteo.de>
Co-committed-by: Robert Wolff <mahlzahn@posteo.de>
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