Empty permissions object for `test/compile/bench` in config file should not require `-P`

Doing this:

```json
{
  "test": {
    "permissions": {}
  }
}
```

Should not error:

```
> deno test
error: Test permissions were found in the config file. Did you mean to run with `-P` or a permission flag?
```

Version: Deno 2.5.3
