Fix data file name parsing #306

Job	Run time
flake8	7s
black	7s
pytest-fast (above_threshold)	22s
pytest-fast (above_threshold_features)	29s
pytest-fast (above_threshold_lcc)	26s
pytest-fast (above_threshold_eu)	38s
pytest-fast (above_threshold_eu_features)	29s
pytest-fast (above_threshold_eu_lcc)	29s
pytest-fast (above_threshold_ua)	25s
pytest-fast (above_threshold_ua_features)	23s
pytest-fast (above_threshold_ua_lcc)	30s
pytest-fast (below_threshold)	18s
pytest-fast (below_threshold_central)	22s
pytest-fast (below_threshold_features)	1m 9s
pytest-fast (close_framework_agreement_ua)	31s
pytest-fast (close_framework_agreement_ua_central)	31s
pytest-fast (competitive_dialogue_eu)	40s
pytest-fast (competitive_dialogue_ua)	29s
pytest-fast (competitive_dialogue_ua_features)	34s
pytest-fast (esco)	27s
pytest-fast (esco_features)	33s
pytest-fast (negotiation)	1m 54s
pytest-fast (negotiation_quick)	1m 11s
pytest-fast (reporting)	20s
pytest-fast (simple_defense)	24s
	13m 48s

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