debuginfo-install: fix logger debug messages

When we trying to install debuginfo rpms I want to log all enabling
repos, but there typo. `format(id)` should be `format(di)`.
```
[cutted]
enabling <built-in function id>
enabling <built-in function id>
enabling <built-in function id>
enabling <built-in function id>
enabling <built-in function id>
enabling <built-in function id>
enabling <built-in function id>
enabling <built-in function id>
enabling <built-in function id>
```
Signed-off-by: Igor Gnatenko <i.gnatenko.brain@gmail.com>