pgsql: Fix NaN comparison in circle_same test

Fix NaN comparison in circle_same test

Commit c4c340088 changed geometric operators to use float4 and float8
functions, and handle NaN's in a better way. The circle sameness test
had a typo in the code which resulted in all comparisons with the left
circle having a NaN radius considered same.

postgres=# select '<(0,0),NaN>'::circle ~= '<(0,0),1>'::circle;
?column?
----------
t
(1 row)

This fixes the sameness test to consider the radius of both the left
and right circle.

Backpatch to v12 where this was introduced.

Author: Ranier Vilela <ranier(dot)vf(at)gmail(dot)com>
Discussion: https://postgr.es/m/CAEudQAo8dK=yctg2ZzjJuzV4zgOPBxRU5+Kb+yatFiddtQk6Rw@mail.gmail.com
Backpatch-through: v12

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/eb8b848079c3e3f8cd486f209e50d0114476d2e8

Modified Files
--------------
src/backend/utils/adt/geo_ops.c | 2 +-
src/test/regress/expected/geometry.out | 3 +--
2 files changed, 2 insertions(+), 3 deletions(-)