consider dealing with emissions factors in ABCD data more cautiously

[cjyetman]

here...
https://github.com/2DegreesInvesting/pacta.data.preparation/blob/04ed2a54fcb20589086937a2d58ed994871ec78f/run_pacta_data_preparation.R#L358-L364

and here...
https://github.com/2DegreesInvesting/pacta.data.preparation/blob/04ed2a54fcb20589086937a2d58ed994871ec78f/run_pacta_data_preparation.R#L413-L419

we set the emissions factors to 0 if the technology is in the user-specified list of zero_emission_factor_techs and the production values are greater than 0. This seems hella questionable and we should consider doing whatever this is trying to achieve in a more sensible way.