🐞 Don't include invisible "d" in k-v.io error msg
🐞 Don't include invisible "d" in k-v.io error msg

We include an invisible "d" in our keys, but we don't want to leak them
to the user (it'll only serve to confuse), so we fix our error messages
to not display them. This code doesn't have coverage, but we don't feel
it's worth the contortions to cover it.

fixes
<https://ci.nono.io/teams/main/pipelines/sslip.io/jobs/unit/builds/23>
(should have been "my-key" not "dmy-key":
```
2021/12/31 17:36:27 couldn't GET "dmy-key": context deadline exceeded
```

cunnie/sslip.io,cunnie/sslip.io,cunnie/sslip.io,cunnie/sslip.io