`ValueError` due to auto fix indexing on `gencost` on data with `Q` `gencost`

```python
cf = CaseFrames(`case9Q.m`, load_case_engine=m)
```

`case9Q` and `case30Q`: `ValueError: Length mismatch: Expected 6 rows, received array of length 3` due to `gencost` data has 2N rows, with starting N+1 rows for reactive power cost.