🐛 fix additional + in git local branches

[AucaCoyan]

Hi! I realized if you use worktrees, with at least one branch checked out and you:

git switch <tab>

the autocompletion is wrong, putting a + before the branch, and piping it into the cmdline.

This comes from nu-complete git local branches function, it which it only replaces * for the current branch, but it doesn't for + for worktrees.
Here is a sample:

I tested on my pc and works allright!

[fdncred]

Thanks