DSS Transformer, UNTRMT_R table, param ten_lin_se

* bdgd-tools version: 1.0.0
* Python version: 3.9
* Operating System: Windows 10

### Description

As quoted by @anacmamede , in the mapping of the DSS element Transformer "Se for aterrado (.0)", this should be considered in the key
```
[" Transformer"]["indirecting_mapping"]["bus2"]
```

### What I Did

```
Nothing was implemented yet
```
