pgsql: Fix query checking consistency of table amhandlers in opr_sanity

Fix query checking consistency of table amhandlers in opr_sanity.sql

As written, the query checked for an access method of type 's', which is
not an AM type supported in the core code.

Error introduced by 8586bf7ed888.  As this query is not checking what it
should, backpatch all the way down.

Reviewed-by: Aleksander Alekseev
Discussion: https://postgr.es/m/ZVxJkAJrKbfHETiy@paquier.xyz
Backpatch-through: 12

Branch
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REL_15_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/63e045c2dcf53eb56d2851acc1236c31f3098a95

Modified Files
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src/test/regress/expected/opr_sanity.out | 2 +-
src/test/regress/sql/opr_sanity.sql      | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)