[git-remote-gcrypt] Cloning a gcrypt repo enters an infinite loop

[Oliv... ier]

## Summary

Cloning a gcrypt repo leads to an infinite loop of new git fetch commands. Each new command has an additional '+' in its command line. The loop stops by killing the clone process (ctrl-c).

Same issue is happening when fetching for the first time from a gcrypt repo.

## To reproduce

Case A)
```
git clone gcrypt://ssh://user@server/remoterepo.git
<ctrl-c>
```

case B)
```
git init repo
cd repo
git remote add remoterepo gcrypt://ssh://user@server/remoterepo.git
git fetch remoterepo
<ctrl-c>
```

## Environment

Ubuntu 20.10

```
$ dpkg -l | grep 'ii\s*git\s'
ii  git                                                         1:2.29.2-0ppa1~ubuntu20.10.1               amd64        fast, scalable, distributed revision control system


$ dpkg -l | grep git-remote-gcrypt
ii  git-remote-gcrypt                                           1.3-1                                      all          encrypted git repositories
```

## Workaround

A valid workaround consists in specifying gcrypt-participants and gcrypt-id before fetching in case B above.

I did not check whether only gcrypt-participants or gcrypt-id is needed or both.

I couldn't get case A above work.


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