pgsql: Remove orphaned expected-result file.

Remove orphaned expected-result file. This should have been removed in 43e084197, which removed the corresponding spec file. Noted while fooling about with the isolationtester. Branch -- REL_13_STABLE Details --- https://git.postgresql.org/pg/commitdiff/0483ae7c513bf2604443fa681811b4a51

pgsql: Remove orphaned expected-result file.

Remove orphaned expected-result file. This should have been removed in 43e084197, which removed the corresponding spec file. Noted while fooling about with the isolationtester. Branch -- master Details --- https://git.postgresql.org/pg/commitdiff/ffbe9dec13599fa786ea6567df1c6a3f3ee3c673