Show current value in menus (#3628)

- **PR Description**

Some of our menus let you pick a value for some option (e.g. the sort
order menus for branches and commits). It's nice to see which one is the
current value when opening such a menu, so this PR implements that.

For menus that also have key bindings, the radio button goes between the
key and the label.

As an alternative, I considered selecting the current value when the
menu is opened; however, we currently have no menus where we select a
different entry than the first one, and it might be confusing for people
who are used to opening a menu and then pressing down-arrow a certain
number of times to get to a particular value.

- **Please check if the PR fulfills these requirements**

* [x] Cheatsheets are up-to-date (run `go generate ./...`)
* [x] Code has been formatted (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#code-formatting))
* [x] Tests have been added/updated (see
[here](https://github.com/jesseduffield/lazygit/blob/master/pkg/integration/README.md)
for the integration test guide)
* [ ] Text is internationalised (see
[here](https://github.com/jesseduffield/lazygit/blob/master/CONTRIBUTING.md#internationalisation))
* [ ] Docs have been updated if necessary
* [x] You've read through your own file changes for silly mistakes etc

0 files changed, 0 insertions, 0 deletions