Fix earthdistance test suite function name typo.

Noah Misch <noah@leadboat.com>

Commit: e7688696db693fe4be8c08ce85fc2bc002bab285
Author: Noah Misch <noah@leadboat.com>
Date: 2018-07-29T19:02:10Z
Releases: 10.5
Fix earthdistance test suite function name typo.

Affected test queries have been testing the wrong thing since their
introduction in commit 4c1383efd132e4f532213c8a8cc63a455f55e344.
Back-patch to 9.3 (all supported versions).

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