Fix TREC-COVID regressions

[lintool]

These regressions hadn't been run in a while - since upgrade to Lucene 9. Changed paths and tweaked expected scores.

[lintool]

Similar to #2195 - we're not able to exactly reproduce... but at least the scripts still run...

These are the commands I ran:

# https://github.com/castorini/anserini/blob/master/docs/experiments-covid.md

python src/main/python/trec-covid/download_indexes.py --date 2020-07-16 &
python src/main/python/trec-covid/download_indexes.py --date 2020-06-19 &
python src/main/python/trec-covid/download_indexes.py --date 2020-05-19 &
python src/main/python/trec-covid/download_indexes.py --date 2020-05-01 &
python src/main/python/trec-covid/download_indexes.py --date 2020-04-10 &

nohup python src/main/python/trec-covid/generate_round5_baselines.py >& logs/log.trec-covid.round5 &
nohup python src/main/python/trec-covid/generate_round4_baselines.py >& logs/log.trec-covid.round4 &
nohup python src/main/python/trec-covid/generate_round3_baselines.py >& logs/log.trec-covid.round3 &
nohup python src/main/python/trec-covid/generate_round2_baselines.py >& logs/log.trec-covid.round2 &
nohup python src/main/python/trec-covid/generate_round1_baselines.py >& logs/log.trec-covid.round1 &

# https://github.com/castorini/anserini/blob/master/docs/experiments-covid-doc2query.md

python src/main/python/trec-covid/download_doc2query_indexes.py --date 2020-07-16 &
python src/main/python/trec-covid/download_doc2query_indexes.py --date 2020-06-19 &

nohup python src/main/python/trec-covid/generate_round5_doc2query_baselines.py >& logs/log.trec-covid.round5-docTTTTTquery &
nohup python src/main/python/trec-covid/generate_round4_doc2query_baselines.py >& logs/log.trec-covid.round4-docTTTTTquery &

[ronakice]

LGTM just this question wherever such code exists