Fix pipeline when running with --small argument

[rouille]

In section 12 (Clean and Reconcile EIA-930 data), the file used to build residual profiles is data/eia930/chalendar/EBA_elec.csv if running small. This file has a different header than the one used to clean the whole year causing the load_chalendar_for_pipeline function located in the eia930 module to raise an error. The issue comes from the filtering of the data frame performed here that returns an empty data frame