Fix data file name parsing #305

Job	Run time
black	8s
flake8	8s
pytest-fast (above_threshold)	21s
pytest-fast (above_threshold_features)	28s
pytest-fast (above_threshold_lcc)	27s
pytest-fast (above_threshold_eu)	31s
pytest-fast (above_threshold_eu_features)	28s
pytest-fast (above_threshold_eu_lcc)	29s
pytest-fast (above_threshold_ua)	27s
pytest-fast (above_threshold_ua_features)	30s
pytest-fast (above_threshold_ua_lcc)	26s
pytest-fast (below_threshold)	17s
pytest-fast (below_threshold_central)	18s
pytest-fast (below_threshold_features)	20s
pytest-fast (close_framework_agreement_ua)	37s
pytest-fast (close_framework_agreement_ua_central)	29s
pytest-fast (competitive_dialogue_eu)	35s
pytest-fast (competitive_dialogue_ua)	39s
pytest-fast (competitive_dialogue_ua_features)	31s
pytest-fast (esco)	24s
pytest-fast (esco_features)	26s
pytest-fast (negotiation)	1m 48s
pytest-fast (negotiation_quick)	1m 9s
pytest-fast (reporting)	27s
pytest-fast (simple_defense)	34s
	12m 57s

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