remfin: fix a corner case for rabin_to_buchi_maybe
when fin_alone sets where presents (i.e., not really Rabin condition), the rabin_to_buchi_maybe() could fail to notice DBA-typeness. * spot/twaalgos/remfin.cc: Don't set scc_ba_type to false when fin_alone is present. * tests/core/remfin.test: Add a test case.
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