Fix thinko in commit 3005c906292700799f236fa04c44dbfbdb5ba734.

Of course, SnapshotNow is still the way to go in 9.3. Discovered through
running the regression tests.
Add missing DB_LOCALE for certain foreign tables in regression tests.

This could lead to spurious connection failures due to mismatching
client and database locales when executing regression tests.