Fix typo in stats_import.sql

Michael Paquier <michael@paquier.xyz>

Commit: 9e8193a26229a2a578619fb3ee0687761aff2ea1
Author: Michael Paquier <michael@paquier.xyz>
Date: 2026-03-08T22:15:26Z
Fix typo in stats_import.sql

The test mentioned pg_stat_ext_exprs, but the correct catalog name is
pg_stats_ext_exprs.

Thinko in ba97bf9cb7b4.

Discussion: https://postgr.es/m/CADkLM=eEhxJpSUP+eC=eMGZZsVOpnfKDvVkuCbsFg9CajYwDsA@mail.gmail.com

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