Fix earthdistance test suite function name typo.

Noah Misch <noah@leadboat.com>

Commit: 28a0b3a2228ba9618225d3641e978b739237f492
Author: Noah Misch <noah@leadboat.com>
Date: 2018-07-29T19:02:11Z
Releases: 9.5.14
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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