Reset the proper GUC in create_index test.
Thinko in commit
a4523c5aa. It doesn't really affect anything at
present, but it would be a problem if any tests added later in this
file ought to get index-only-scan plans. Back-patch, like the previous
commit, just to avoid surprises in case we add such a test and then
back-patch it.
Nikita Glukhov
Discussion: https://postgr.es/m/
8b70135d-ad38-bdd8-ac92-
71e2b3c273cf@postgrespro.ru