Fix loop var in first code sample

[zstumgoren]

election_results.py includes a loop that overwrites a previously declared variable. Script still works but it's a little too confusing for teaching purposes. Change needs to be made below and should be carried over to all elex dirs, branches and tutorial pages to ensure consistency:

for race_key, cand_results in results.items():
    all_votes = 0 
    cands = []
   # NOTE: below "results" var should be renamed to "row"
    for cand_key, results in cand_results.items():
        # Populate a new candidate dict using one set of county results
        cand = { 
            'first_name': results[0]['first_name'],
            'last_name': results[0]['last_name'],
            'party': results[0]['party'],
            'winner': '', 
        }