Make `:Git branch` interactive when checking out w/ `coo`

[kristoferfannar]

Warning, this is quite petty, but I'll add this here nevertheless.

I've been using coo to checkout to different branches with the branch view provided by :Git branch. It's very neat, but I'd like to see the asterisk move to be in front of the newly checkout-ed branch, after checking out to it.

Example:

I'm on main, as can be seen by the asterisk.

Now, I've checked out to the maxConnections branch using coo within the :Git branch view, but the asterisk hasn't moved.

As I said, this is very petty and not too important, but it would definitely improve the user experience using the :Git branch command.