Bugs and Issues tabs are selected at the same time after the Back button #3001

1. You're on this issue (it works with any issue, not just bugs)
2. Click the repository’s Code tab
3. Go back in the browser (history.back())

<img width="336" alt="bugs-tab-bug" src="https://user-images.githubusercontent.com/1402241/79167277-68f49c00-7de7-11ea-854a-e26210c0438e.png">

Semi-related possible enhancement: the bugs tab should be selected when opening a "bug" issue like this one