Limit eartdistance regression testcase to the public schema

Hello hackers,

We try to run the entire postgres regression test suite with our
extensions loaded into custom schemas, to verify that we don't break
anything. This works quite well, except for one issue: the
earthdistance regression test case displays everything from every
schema, and because of this, we have to record an alternative output
for it. And we have to rerecord this every time we change something in
an extension.

I attached a simple patch to the test case that modifies it to only
list objects from the public schema. Part of the test case is already
limited to the public schema, this patch just aligns the rest to do
the same.

What do you think?