Bugfix for GOES Flare Code

**Summary:** Minor bugfix to remove remove an indent that prevents flare class from being added to dataframe if there is only a single flare found.

**Test Code:**

```python
import datetime, gme
goes_data   = gme.sat.read_goes(datetime.datetime(2013,5,12),datetime.datetime(2013,5,14),15)
flares      = gme.sat.find_flares(goes_data,min_class='X2')
```

After this patch is applied, `flares` will be a dataframe containing both X-ray data and the string of solar flare class.