Unify a recently-added inconsisnt message

Subject: Unify a recent-added inconsisnt message

Hello.

I noticed that the recent commit cd3c45125d2 introduced the following
three inconsistent messages at the same time:

pg_dump.c:
+       printf(_("  --no-policies                do not dump row security policies\n"));

pg_dumpall.c:
+       printf(_("  --no-policies                do not dump row security policies\n"));

pg_restore.c:
+       printf(_("  --no-policies                do not restore row level security policies\n"));

The existing user-facing messages commonly use "row security".
Therefore, I believe the newly introduced message should follow the
same wording for consistency.

Please find the attached patch that updates the inconsistent message.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center